GPS satellite navigation system - principle, diagram, application. New Leadtek GPS modules based on SiRF Star III technology. Comparative analysis of embedded GPS modules presented on the Russian market

Technology is moving forward - tablets are improving more and more every day. No matter which way you look, you will see a tablet or phone the size of a tablet. This is the trend in our world and this is the right trend, I think.

About 10 years ago we had a laptop at our disposal. At that time, laptops were seriously inferior desktop computers. However, they coped with most tasks with dignity. But this was not enough for us and humanity began to cram mobile phones with various innovations. In the year 2006, we could already boast of our “smart” phones, capable of receiving and transmitting data, making it possible to check email and even download a melody and play a video. But this was not enough. Today, what we don’t have, all we have to do is choose.

Tablets have become a kind of “golden mean” between all devices. Their functionality and power are growing. Now, having a tablet, it is not necessary to have a laptop, but having cool smartphone, you don't have to have a tablet.

Many people know that a tablet with a GPS module can be a pretty good substitute for a specialized GPS navigator. This is true, but keyword“quite” should have alerted you slightly. The fact is that although tablet manufacturers “shove” very tiny GPS modules into them, this does not mean that they are painstakingly working to ensure that this GPS module functions perfectly. As a result, it turns out that the Jeepies module is there, but there is no connection with the satellites at all. But you shouldn’t jump to bad conclusions right away. Although we lose in quality, we instead gain a lot in power and capabilities.

The conclusion is this - you need a purely navigator - take the usual Navik without unnecessary bells and whistles, which do not at all add up to the functions of showing the road to the driver (radio, 3G, Wi-Fi, video, Android system and so on). However, if you need a device that can show you the way, watch the film and read it on Odnoklassniki news feed, then you need to take the tablet.

In this article we have a money limit of 10 thousand. As for a tablet, this is quite a normal, I would say, average price. Therefore, today we will omit all these Chinese things that do not inspire confidence.

I chose the following TOP 3 tablets: ASUS Nexus 7 16Gb, Prestigio MultiPad 4 PMP7480D 3G, Acer Iconia Tab A100 8Gb.

The brands themselves are very well known in our open spaces, so I see no point in talking about the companies themselves and their variety of products.

Asus Nexus 7

Let ASUS Nexus 7 be the first in line, I really liked it. In online stores its cost is around 10k, + 200-300 rubles. In Asus branded stores it costs 9900.
What does it have “under the hood”? It has Android 4.3 version. Equipped with 4 nuclear processor, Qualcomm Snapdragon(APQ8064 1500 MHz) - a very massive and angry beast, I would call it that this processor. And even an Adreno 320 video processor. 2 gigs RAM, yes, my old PC has even less. The built-in memory is 16 GB, which is also quite enough.

PS: All 3 models have 7-8 inch screens, since it will be extremely difficult to use a 10” in a car as a Navik.

The hefty resolution of 1920×1200 is a lot for such a screen; the human eye cannot see the pixels. IPS matrix. There is Wi-Fi and there is Bluetooth, where would we be without them in our time? By the way, the Bluetooth version is 4.0. Rear camera by 5, front by 1.2 pixels. The photos come out decent. Two speakers, that is, we have stereo sound. Of course there is GPS, and even with A-GPS support. GLONASS is present. Battery 3950 mAh.

Acer Iconia Tab A100

The next turn fell on the Acer Iconia Tab A100. Previously, I always confused Acer and Asus, even when I bought a laptop, I could not decide between the model of one and the other company.

The cost of this unit fluctuates around 9 thousand rubles. Has the 4th Android, but this is such a thing, today it’s 4, and tomorrow you’ll upgrade to 4.3... Percentage for 2 cores, but Nvidia Tegra 2 (1000 MHz), Nvidia processors Tegra are the best of their kind and not just in my opinion. We have 1 GB of RAM, which is more than enough for today. Built-in memory is 8 GB, but don’t forget about flash drives. The screen resolution is slightly lower, 1024x600, but the diagonal is the same. IPS is missing, if it is very important to anyone, personally, not particularly important to me. The video processor is also from NVIDIA. Wi-Fi, Bluetooth (2.1 EDR) - everything is in place. The rear camera has 5 million pixels, the front camera has 2. GPS, A-GPS are of course available, otherwise this device would not be on our list. micro port HDMI. The battery has a capacity of 1530 mAh (this is really not enough).

Prestigio Multipad 4

And finally, Prestigio MultiPad 4. Its cost is about 9,000. The standard price is 4.2 Android. Has 4 cores, MediaTek MT8389 (1200 MHz). RAM in the amount of 1 GB. Built-in memory 16. But the screen is slightly larger, 8” by 1024x768, IPS. Video processor PowerVR SGX544. In addition to Wi-Fi and Bluetooth, it is equipped with a 3G module - a nice addition. The rear camera is 8 million pixels, but you should know that the number of pixels is not entirely responsible for the quality, the front camera is 2 million. GPS is also with prefix A. The battery has a capacity of 4850 mAh. + little case, Prestigio loves to give cases.

The GPS module is a radio receiving device that is designed to determine the location of the receiving antenna at the current time based on data on the time delays of the arrival of radio signals.

Many people often confuse concepts such as GPS and GPRS. GPRS technology is intended for accessing mobile Internet, System technology) means satellite navigation system. The GPS receiving module does not transmit anything, it only receives data from satellites and determines its location by solving a mathematical problem. In order for the device to determine its location (coordinates), it is required that the device sees at least four satellites. The more satellites the GPS module sees, the more accurate the coordinates will be. The receiver sensitivity and operating speed are determined by the microcircuit used in the device. Speed refers to how quickly the device is able to determine coordinates. Sensitivity refers to the receiver's ability to detect the maximum number of satellites.

GPS navigators can be divided into two types: professional, which have high accuracy in determining coordinates, and household ones. The first ones found application in the military sphere, in geodesy, cartography, but household ones can be found in almost any area modern life. Professional devices are different high quality manufacturing not only components, but also antennas, software, operating frequencies, increased energy reserves, and most importantly - price.

What is the GPS module used for? First of all, these devices can be useful to motorists. After all, even in your own hometown You don’t always know how to get to this or that place. GPS devices help not only to get to a given street, but also to accurately determine the required house number. Also, these devices can lay optimal route to specified address, avoiding traffic jams and roads with oncoming one-way traffic, as well as streets and emergency areas closed for repairs. A GPS navigator is also indispensable for traveling to unfamiliar places. It will help you quickly get to any city and any address you specify.

However, you should not think that these devices are needed only by motorists. It can also be indispensable for pedestrians, especially tourists. So, a GPS module for a tablet or mobile phone can help a traveler navigate a foreign city, find any attractions, shops, markets, etc., and most importantly, help him return back to the hotel. And you won’t have to, without knowing the language, pester passers-by to show you the right path.

Many outdoor enthusiasts, such as hunters, mushroom pickers, and fishermen, often use GPS navigators: they help them get out of any slum and return to civilization.

Also similar device helps find stolen equipment. For example, it can help determine the location of your device, which greatly helps in the search for stolen items.

Thanks to improvements in the NAVSTAR GPS satellite positioning system, in recent years there has been a significant expansion in the applications of embedded GPS modules. The article presents brief overview latest developments from Leadtek Research Inc. based on new SiRF GPS chips. A comparison was made with other built-in GPS modules on the market.

Built-in GPS modules

Today, no one needs to explain what GPS is. The amazing capabilities of this system have long been known to tourists, fishermen and motorists - those who prefer to relax away from home, the bustle of a noisy city, a stuffy apartment and other “benefits” of civilization.

However, the market for built-in GPS modules has been developing at the fastest pace in recent years. Such modules represent a small-sized GPS receiver that is completely ready for use and does not require additional external elements and is used by manufacturers of end devices. The main consumers of embedded GPS modules continue to be manufacturers of monitoring and security systems for ground-based mobile objects, which include automotive security systems, monitoring and control systems for municipal and departmental transport, as well as monitoring and dispatching systems for cargo transportation. New promising areas for the use of embedded GPS modules are personal monitoring and systems hidden tracking. Until recently the question using GPS in wearable devices remained open. There are several reasons for this: firstly, higher sensitivity is required to receive GPS signals indoors and in vehicles, secondly, power consumption must be low enough to ensure long battery life for the device, thirdly, a wider range of ,compared to traditional planar GPS antenna, radiation pattern. The last problem, in principle, has been solved, since cylindrical antennas have existed for quite a long time, the radiation pattern of which is close to that of an isotropic emitter. The use of new solutions from the world's largest manufacturers of GPS chips today allows us to solve both the problem of high sensitivity and low power consumption. Personal monitoring and covert tracking systems have already found application in private security structures. The Ministry of Internal Affairs and the Ministry of Emergency Situations are also customers of such systems.

New Leadtek GPS modules

Today on Russian market There are several dozen built-in GPS modules from various manufacturers, and consumers - manufacturers of end devices - can only choose the receiver that will be most suitable in terms of sensitivity, price, design, etc. The purpose of this article is to introduce the reader to the line of new GPS modules Leadtek company, created on the basis of SiRF chips. The article also presents a comparative analysis of Leadtek modules and other OEM GPS receivers widely known to Russian developers.

At the heart of any GPS receiver is a set of chips that provides reception and processing of signals from satellites - the so-called GPS chip. The undisputed market leader, ranking first in the world in sales of GPS chips, is SiRF Technology: 70% of GPS chips sold in the world are produced by SiRF. The company has existed for more than 10 years and now has advanced developments in the field of GPS, and its SiRF Star III GPS chip has de facto become an advanced solution in terms of sensitivity, with which modules from other manufacturers are compared on the English-language Internet. SiRF quickly abandoned the production of its own modules, focusing its attention on the development of chips and internal software for GPS. The production of receivers based on SiRF chips is carried out by many companies around the world, most of which are located in Asia. Leadtek has a close relationship with SiRF partnerships(value-added manufacturer contract), as evidenced by the relevant information presented on the SiRF website.

Leadtek Research Inc. is the largest research and manufacturing company in the Asia-Pacific region, headquartered in Taipei, Taiwan. The company was founded in 1986 and is now developing a wide range of IT devices: multimedia devices, motherboards, equipment for video conferencing, GPS navigation and wireless communication. Along with this, Leadtek is the largest Asian manufacturer of GPS receivers. In recent years, one of the company’s leading areas of activity has been the production of built-in GPS modules. And these are, first of all, highly sensitive modules based on the SiRF Star III architecture.

As is known, the sensitivity of a GPS receiver is determined, among other things, by the processing and analysis features of signals received from satellites. The main parameter of the received signal is its range delay, which can be calculated using a set of correlators. To achieve high sensitivity, the GPS receiver must analyze a sufficient number of signal delays in parallel. Availability large quantities correlators significantly improve receiver performance, resulting in improved sensitivity and reduced Time To First Fix (TTFF) compared to conventional receivers. In GPS modules based on SiRF Star III, the total number of parallel correlators is 200,000, which allows the modules to achieve a sensitivity of -159 dBm. In conditions good reception signal, this means that the signal is captured almost instantly. At weak signals Signal integration may take several seconds. For example, the modules of SiRF's closest competitor, the Swiss company u-blox, which are based on their latest development ANTARIS 4, contain only 8,192 correlators. All of the above is especially important in relation to personal monitoring devices, where, along with high sensitivity, it is necessary to ensure a short TTFF time. This year, Leadtek introduced a miniature high-sensitivity GPS module based on the SiRF Star III chipset - GPS9101, its size is 15.0 × 14.0 × 2.8 mm. The presence of a built-in low-noise amplifier and bandpass filter allows the receiver to show excellent characteristics when working with a passive antenna. Thanks to its miniature size, high sensitivity and fast location time, Leadtek GPS9101 is ideal for use in personal monitoring devices. The module's 70 mA power consumption can be reduced by a factor of 3 when using the Adaptive Trikle Power power saving mode. IN mobile devices ah, where constant monitoring is not so important, the Push-to-Fix mode can be used, in which the module consumption is hundreds of microamps. In this case, the location is determined at regular intervals, set in such a way as to ensure the specified energy consumption.

Another module based on the SiRF Star III chipset, designed for a wide range of applications, is Leadtek GPS9548S. This 20-channel GPS receiver also features high sensitivity and fast cold start time. One of the possible applications of the receiver could be security monitoring systems for vehicles and cargo, for which the high sensitivity and reliability of the GPS receiver is especially important. The latest in the line of new Leadtek GPS modules is the GPS9805ST receiver, designed for a wide range of devices that, along with high sensitivity, require the lowest possible power consumption. The module is based on the SiRF Star II GSC2x chipset and contains a highly sensitive built-in software SiRF Xtrack, due to which its tracking sensitivity is –154 dBm. The advantage of the receiver is low power consumption (32 mA) and miniature size, which is important when developing mobile devices. The advantages of Leadtek receivers also include a large range of supported functions. The receiver has two serial ports, support for satellite differential service systems WAAS and EGNOS. Leadtek GPS9548S and GPS9805ST modules are pin-to-pin compatible and interchangeable.

Comparison of Leadtek modules with other common GPS receivers

Chips from SiRF also form the basis of GPS modules, which are produced under the Orcam brand. Many Russian developers are well aware of the GPS20 and GPS21 modules from Orcam. This year they were replaced by GPS25 and GPS26 receivers, which are based on the new SiRF Star II GSC2x chip. GPS25 and GPS26 are pin-out and functional analogs of GPS20 and GPS21 that meet RoHS requirements. The GPS26 receiver, unlike the GPS25, contains a built-in low noise amplifier (Low Noise Amplifier - LNA), which allows it to work with a passive antenna. In addition, both GPS25 and GPS26 come with two different versions embedded software. The use of highly sensitive SiRF Xtrack firmware by changing the signal processing and analysis algorithm allows Orcam modules to receive signals approaching a level of –154 dBm. New Orcam modules are distinguished by extremely low power consumption (25...40 mA, depending on the version), which is often a determining factor in the development of self-powered devices. It should be noted that consumption can be further reduced by 2-3 times when using special adaptive modes Adaptive Trickle Power and Advanced Power Management. The advantages of Orcam receivers also include a wide range of supply voltages, which guarantees the versatility of the module.

Another manufacturer of GPS modules that is well known to developers is the Swiss company u-blox AG, which produces modules based on ANTARIS 4 technology. This basic technology processing of navigation signals in modern models of u-blox receivers, developed in collaboration with Atmel. It provides good sensitivity, low power consumption and a short time to first determine the position, provided the signal level is good. u-Blox modules are available in two designs - TIM-xx and LEA-xx. The main difference between the TIM and LEA series receivers is the smaller size of the LEA series modules and the presence of a USB 1.1 interface in them. Modules of both series are 16-channel GPS receivers. TIM series receivers are pin-to-pin compatible with Orcam modules, but Orcam modules are 2.5mm smaller in width. It should also be noted that solutions based on SiRF technology are often cheaper than similar solutions from u-blox, since a huge number of its partners around the world are engaged in the production of receivers based on SiRF chips.

As one of the pioneers in the GPS field, Trimble continues to develop embedded GPS modules and focus on delivering complete end-to-end solutions. A Trimble-developed chipset and architecture called First GPS underpins several modules. For our review, the most interesting module is Lassens iQ, which is one of the company’s latest developments. Speaking about this receiver, one cannot fail to note its low power consumption, comparable to that of the Orcam25S. Unfortunately, this is perhaps the only advantage of Lassens modules. The sensitivity of Lassens iQ is inferior to that of other modules, which is caused by the rather old architecture of the receiver, which actually does not allow creating solutions similar to those created on the SiRF and ANTARIS chipsets. It is also worth noting that the actual price of the receiver, unlike all other modules presented in the review, increases by the cost of the mating connector and cable assembly required to connect the antenna.

In 2003, Tyco Electronics introduced the A1029-A module, which is the first member of a new generation of GPS receivers. The receiver is built on the basis of an ARM microcontroller from ST Microelectronics - STA2051, as well as a miniature GPS crystal SE4100L. The result of this combination was a completely complete module, designed as a surface-mount component. In addition to supporting the NMEA protocol, the receiver (as well as all other modules presented in the review) produces a high-precision pulse per second (1 pps), synchronized with Universal Time Coordinated (UTC). In terms of “cold” start time, the receiver is significantly inferior to modules based on SiRF and ANTARIS chips, but after acquiring satellites it shows good sensitivity, although, nevertheless, it does not reach the level of modules based on SiRF chipsets. The advantages of the module also include support for DGPS (differential mode, which significantly improves reception accuracy) and SBAS - differential service satellite subsystems. The overall dimensions and power consumption of the A1029-A module exceed those of other receivers presented in the review, which significantly limits its use in mobile devices.

Conclusion

The experience accumulated by SiRF Technology over the years of its existence allows it to occupy a leading position in the development and production of GPS chips. Leadtek, as SiRF's largest Asian partner, is constantly updating its line of GPS modules in accordance with the latest SiRF developments. According to basic characteristics, such as sensitivity, time to determine the first position, overall dimensions, energy consumption, Leadtek products are ahead of most competitors. Leadtek GPS receivers are made in the form of SMD components and are suitable not only for automatic, but also for manual soldering, which makes it possible to use them in small-scale production. The ease of integration of the module can significantly reduce the cost and reduce the time required to create the final device. The advantages of Leadtek GPS receivers make them attractive to both large manufacturers and small companies that use modern technologies in their developments. Currently, we can confidently say that Leadtek solutions based on SiRF Star III chipsets (GPS9101 and GPS9548S modules) are advanced, and analogs based on chipsets from other manufacturers are significantly inferior to them in sensitivity and time to first position determination (TTFF).

Table. Comparative characteristics modules

Literature

Alekseev V., Leksin A. Navigation without borders // Connect!. 2005. No. 2.
www.leadtek.com.tw/eng/gps
www.sirf.com
www.u-blox.com
www.tycoelectronics.com
www.trimble.com

Finally, DVRs have firmly and, undoubtedly, entered Russian automotive life for a long time. However, if for some they are just an opportunity to launch an adventure on Youtube in order to “become famous” for their road “feat”, then for millions of other drivers this is a really effective means of clarifying controversial transport situations.

It is worth dwelling on this most important use of them. For what? Any recorders can record pictures. However, to verify the authenticity of recorded video facts, great value will have evidence of the location and time of recordings. Therefore, a combination of a navigator and a DVR works better as “witnesses”.

The GPS module is shaped like a tablet, exactly copying the base of the DVR, and connected to it with a tail cable. It is especially profitable to buy a recorder with a vertical housing. This form factor allows the device to be installed between the rearview mirror and the glass. The main thing is that the control buttons of the device do not cover, and that the camera “looks” more into the glass cleaning sector with the right wiper.

It is enough if the fastening of this equipment is provided by double-sided tape. So, if necessary, your recorder can be removed, leaving only the GPS module on the glass. Although, of course, the adhesive tape connection makes the structure stationary, because it is not designed for repeated removal. An important advantage of “advanced” recorders is the ability to synchronously connect a second camera.

It doesn't seem necessary to have a separate power key if you like automatic start of recording (in power-on mode). When first turned on, the GPS module can pick up satellites for more than a minute, but with the next activation the signal will be processed faster.

Meanwhile, it makes sense to connect recorders not to the cigarette lighter, but to constant source nutrition. Then, after several minutes of standing and, accordingly, the absence of vibrations, the parking mode is activated.

Such DVRs themselves transform into security cameras. They are not recorded continuously, but only when the built-in shock sensors are triggered. Sometimes this option requires purchasing an optional CVR/DPC cable, with a voltage control unit that turns off the recorder if the battery starts to run low.

It is preferable to choose a DVR that normal mode can take screenshots, as well as save fragments separately, while recording the episode a few seconds before and a few seconds after pressing one button. Each file must contain data on the coordinates of the location and time of recording.

It’s good if the “stuffing program” is capable of linking coordinates to Google Maps. With its help, you can use maps to track your route in a clear and convenient way. The video resolution should be enough to read the license plate of the car not far ahead.

So, if you want to buy a DVR to monitor the situation on the road, evaluate all the listed parameters. But which one is the most important as a witness, have no doubt - this is the navigation module.

A GPS navigator is the most useful thing for people who often visit new places or travel by car. Orientation in space via satellite is an incredibly convenient feature. Previously, only special devices had this feature, but now many tablets can boast of this function. Gadgets have many advantages over classic navigators, so purchasing a “tablet” is much more logical. Choose the most suitable device our traditional rating will help best tablets with a GPS navigator, which will definitely not allow you to get lost in an unknown area.

Samsung Galaxy Tab A 10.1 SM-T580

The most popular tablet today with a 10-inch diagonal boasts a rich and rich Full HD resolution and good sensor responsiveness. The GPS navigator works very quickly, showing the slightest movements, and also supports GLONASS. High quality and convenient tablet from Samsung with the fast operation of an 8-core processor with a frequency of 1600 MHz, as well as excellent rear camera at 8 MP. With GPS turned on, the operating time of the device can reach 13-15 hours, since it runs on Wi-Fi, which is much more economical than transmitting data over mobile networks.

Advantages:

capacious battery - 7300 mAh
good amount of RAM - 2 GB
good front camera – 2 MP
Supports many video and audio formats
high-quality assembly

Flaws:

all speakers are on one side only
no support for 3G and LTE

Huawei Mediapad T2 7.0 Pro

If you want to choose a tablet with a GPS navigator and GLONASS module with a small screen, but with a huge number of additional functions, it’s worth paying attention to the new product from Huawei. The proposed model has a 7-inch display with a 1920x1200 format picture, slots for two SIM cards and an excellent 5 MP front camera. The rear optics with a 13 megapixel matrix are also worthy of attention, which you will definitely need when traveling. For a price tag of 15,000 rubles, this set of functions is simply wonderful. Fans of high-quality, stylish electronics should definitely watch the official video review of the tablet.

Advantages:

8-core chip with a frequency of 1500 MHz
RAM 2 GB
4360 mAh battery
fingerprint scanner
fast connection to satellites
good sound

Flaws:

minor problems with backlight settings
inconvenient location of the fingerprint scanner

Lenovo Tab 3 TB3-850M

Next in the ranking we will consider a good one Chinese tablet with GPS from Lenovo. The 8-inch diagonal model with HD display allows you to enjoy a responsive touch and fast work a system that interacts perfectly with navigators from Google and Yandex. Two SIM cards are a great opportunity to use inexpensive tablet even outside your region or country.

Advantages:

picks up the signal perfectly
working in mobile phone mode
good battery 4290 mAh
processor with 4 cores and a frequency of 1000 MHz

Flaws:

The top part gets very hot sometimes
weak cameras

ASUS ZenPad 8.0 Z380M

If you have allocated only 10,000 rubles for a new gadget, the question of which tablet with a GPS navigator to buy should be clear - ASUS ZenPad 8.0. A fast 4-core chip with a frequency of 1200 MHz, an 8″ diagonal HD display, 5 and 2 MP cameras – a chic set of parameters for a budget device. Confirms excellent value for money good job tablet by connecting to the network from the cigarette lighter: this method allows you to charge a 15.2-watt battery in a couple of hours.

Advantages:

The battery lasts for 8-10 hours
fits comfortably in your hands thanks to ergonomic curved edges
fast operation of GPS navigator
great appearance
tablet with good screen

Flaws:

little RAM - only 1 GB
weak Wi-Fi module
no flash on the main camera

Prestigio MultiPad PMT3118С

Our TOP continues with a high-quality budget tablet with a GPS module from Prestigio. It may not be well known in wide circles, but this does not reduce its attractiveness. The combination of simultaneous operation with 2 SIM cards, a metal case and an 8-inch HD display is an offer that you should not refuse. The tablet can be bought quite inexpensively, the price will not exceed 5,000 rubles.

Advantages:

4000 mAh battery
4-core processor at 1200 MHz
display with good viewing angles and good brightness
combination of price and functionality
light weight and compact dimensions

Flaws:

weak cameras
quiet speaker

Irbis TZ745

After looking through several forums and looking at many driver reviews about this tablet, you might think that only taxi drivers use it. Of course, in this profession, a gadget for 3000-4000 rubles - ideal option inexpensive GPS navigator, but Irbis's budget device is also popular among ordinary buyers. Inexpensive, easy to use, does not slow down, works with two SIM cards, cards load quickly... What else does a driver need to be happy? Of course, the tablet will not handle toys well, because its characteristics are frankly weak for them, but the device is not intended for entertainment at all.

Advantages:

there is support for A-GPS
processor Spreadtrum SC7731G at 1.3 Ghz
display with good resolution
combination of price and quality
good navigation quality

Flaws:

no light sensor
small amount of RAM
light indication not installed

Prestigio MultiPad PMT3147

Another cheap tablet with a GPS navigator from the Chinese company mentioned above is a little more functional compared to its predecessor. Front camera received a 3.2 MP matrix, rear – 5 MP. The 4-core processor operates at a frequency increased to 1300 MHz, which even allows you to play some games. Two SIM cards are an excellent option for any driver, so having two slots is definitely worth adding to the mix.

Advantages:

7-inch screen, picture format 1024x600
The battery, despite its small capacity of 2800 mAh, holds a charge well
good optimization
latest version of Android OS 6.0
fast 3G internet

Flaws:

no flash on cameras
Screen viewing angles

Which tablet with GPS navigator should I buy?

A good tablet, optimized for GPS support, is the best travel companion for any traveler. Buying a simple navigator today does not make sense, since most “tablets” are capable of accurately plotting a route and telling you the way to your destination using maps and the Internet. In addition, the devices also offer many additional features that will definitely be useful on the road. Find ideal model The TOP 7 best tablets with a GPS navigator, selected by our experts, which have received the best reviews from customers, will help.