It has -165 dBm sensitivity, 10 Hz updates, 66 channels, built in RTC (requires an external battery), fix indicator output to drive an LED, PPS output, ultra low power (only 20mA!), high-altitude capable, built in data-logging with 64K FLASH storage, and an enable pin. You can power the module with up to 5V but logic levels are all 3.3V so you may need level shifting if using in a 5V system. All for under $30!
The module is built around the MTK3339 , a no-nonsense, high-quality GPS chipset that can track up to 22 satellites on 66 channels, has an excellent high-sensitivity receiver (-165 dB tracking!), and a built in antenna. It can do up to 10 location updates a second for high speed, high sensitivity logging or tracking. Power usage is incredibly low, only 20 mA during navigation.
Two things that really stand out about this MTK3339 module is the high-altitude functionality and the the built in data-logging capability. Most modules permit NMEA output only when the module is traveling under 515 m/s AND when its at an altitude of under 60,000 ft (18,000 m). This is to prevent the modules from being used for military use. However, as the requirements are not as strict, we've requested the factory to keep the speed limit but remove the altitude restriction. We trust that the factory has removed the limit but we have not done independent verification yet. If this feature is critical, please do not purchase until we've personally verified it!
The other cool feature of the new MTK3339-based module (which we have tested with great success) is the built in datalogging ability. Since there is a microcontroller inside the module, with some empty FLASH memory, the newest firmware now allows sending commands to do internal logging to that FLASH. The only thing is that you do need to have a microcontroller send the "Start Logging" command. However, after that message is sent, the microcontroller can go to sleep and does not need to wake up to talk to the GPS anymore to reduce power consumption. The time, date, longitude, latitude, and height is logged every 15 seconds and only when there is a fix. The internal FLASH can store about 16 hours of data, it will automatically append data so you don't have to worry about accidentally losing data if power is lost. It is not possible to change what is logged and how often, as its hardcoded into the module but we found that this arrangement covers many of the most common GPS datalogging requirements.
This item is just the GPS module itself, no breakout board or other components included. The module can be soldered by hand without too much difficulty, we have it in our Eagle Library (GPS_FGPMMOPA6C) to make it easy to use. If you're interested in getting started fast, check out our Ultimate GPS breakout board which comes all assembled and tested.
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