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Ultimate GPS Breakout - 66 channel w/10 Hz updates - MTK3339 chipset

Ultimate GPS Breakout - 66 channel w/10 Hz updates - MTK3339 chipset
Ultimate GPS Breakout - 66 channel w/10 Hz updates - MTK3339 chipsetUltimate GPS Breakout - 66 channel w/10 Hz updates - MTK3339 chipsetUltimate GPS Breakout - 66 channel w/10 Hz updates - MTK3339 chipsetUltimate GPS Breakout - 66 channel w/10 Hz updates - MTK3339 chipset
Our Price:  £39.90(Inc. 20% VAT)(£33.25 Exc. VAT)Earn 39 Loyalty Points

Part Number:  746
Brand:  AdaFruit

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  (12 Reviews)

We carry a few different GPS modules here in the Adafruit shop, but none that satisfied our every desire - that's why we designed this little GPS breakout board. We believe this is the Ultimate GPS module, so we named it that. It's got everything you want and more:

  • -165 dBm sensitivity, 10 Hz updates, 66 channels
  • 5V friendly design and only 20mA current draw
  • Breadboard friendly + two mounting holes
  • RTC battery-compatible
  • Built-in datalogging
  • PPS output on fix
  • Internal patch antenna + u.FL connector for external active antenna
  • Fix status LED
  • New! Version 3 comes with the latest module which has external antenna support and Pulse-Per-Second output

...all for under £40!

The breakout is built around the MTK3339 chipset, a no-nonsense, high-quality GPS module 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.

Best of all, we added all the extra goodies you could ever want: a ultra-low dropout 3.3V regulator so you can power it with 3.3-5VDC in, 5V level safe inputs, ENABLE pin so you can turn off the module using any microcontroller pin or switch, a footprint for optional CR1220 coin cell to keep the RTC running and allow warm starts and a tiny bright red LED. The LED blinks at about 1Hz while it's searching for satellites and blinks once every 15 seconds when a fix is found to conserve power. If you want to have an LED on all the time, we also provide the FIX signal out on a pin so you can put an external LED on.

Two features that really stand out about version 3 MTK3339-based module is the external antenna functionality and the the built in data-logging capability. The module has a standard ceramic patch antenna that gives it -165 dB sensitivity, but when you want to have a bigger antenna, you can snap on any 3V active GPS antenna via the uFL connector. The module will automatically detect the active antenna and switch over! Most GPS antennas use SMA connectors so you may want to pick up one of our uFL to SMA adapters.

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.

Comes with one fully assembled and tested module, a piece of header you can solder to it for breadboarding, and a CR1220 coin cell holder. A CR1220 coin cell is not included, but we have them in the shop if you'd like to use the GPS's RTC

We have a nice fancy library for GPS usage, with background parsing and can set and query the built in GPS logging capability (called LOCUS). A full tutorial is also available, which has tons of information about the module, how to use the data logger, example code for both CircuitPython & Arduino, and more

Technical Details

  • Satellites: 22 tracking, 66 searching
  • Patch Antenna Size: 15mm x 15mm x 4mm
  • Update rate: 1 to 10 Hz
  • Position Accuracy: < 3 meters (all GPS technology has about 3m accuracy)
  • Velocity Accuracy: 0.1 meters/s
  • Warm/cold start: 34 seconds
  • Acquisition sensitivity: -145 dBm
  • Tracking sensitivity: -165 dBm
  • Maximum Velocity: 515m/s
  • Vin range: 3.0-5.5VDC
  • MTK3339 Operating current: 25mA tracking, 20 mA current draw during navigation
  • Output: NMEA 0183, 9600 baud default, 3V logic level out, 5V-safe input
  • DGPS/WAAS/EGNOS supported
  • FCC E911 compliance and AGPS support (Offline mode : EPO valid up to 14 days )
  • Up to 210 PRN channels
  • Jammer detection and reduction
  • Multi-path detection and compensation

Revision History:

  • As of 8/10/2014 we are shipping with firmware v. 5632 which improves altitude calculations and stability. It is equivalent in all other functionality and is a drop-in replacement.
  • As of Feb 1, 2017 we have made minor silkscreen updates, improved the ground plane for better reception, increased the mounting hole diameter to 2.5mm from 2.0mm, and added a protection diode to the VBAT line. Functionality is otherwse the same.

Breakout board details:

  • Weight (not including coin cell or holder): 8.5g
  • Dimensions (not including coin cell or holder): 25.5mm x 35mm x 6.5mm / 1.0" x 1.35" x 0.25"

Datasheets, schematics, GitHub links, Fritzing and more available in the product tutorial


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Customer Reviews
Average Rating (12 Reviews):  
Write a Review and share your opinions!

Thursday, 15 October 2015  |  Jack

Got it working with the Adafruit library no problem. If you're thinking of using this for a GPS data logger beware writing coordinates which usually are stored in a float requires splitting the float into separate bytes which is a bit difficult.Accura


2 of 2 people found this review helpful.

Simple to access, accurate and good quality.
Thursday, 23 April 2015  |  Trevor

As with most Adafruit products, it works well. It is simple to interface to and has an abundance of support. I was up and running in less than 5 minutes. The RTC and logging features work well. If you need GPS for you application then this will do the jo


2 of 2 people found this review helpful.

Great starter GPS
Wednesday, 22 April 2015  |  S

This unit is a great value board to start with GPS. We have managed to get a fix inside on several occasions, though ideally the chip needs a clear sky view - an external antenna would help. Lots of sample code out there and works great with the library.


2 of 2 people found this review helpful.

Extremely high quality
Friday, 9 May 2014  |  Will

I bought this to use in a reverse Geocaching box I made for my sister's birthday. It was very easy to use (I used Adafruit's arduino library but I believe you can use the Tiny GPS library without any issue), was nicely compact and got GPS fix reasonably q


2 of 2 people found this review helpful.

speedy lock
Tuesday, 18 March 2014  |  Daniel

once the unit is placed in clear view of the sky without too many obstructions it locks onto the gps signals very quickly. I plan on hooking this up to an external antenna for better reception and less jitter. I have it wired into a raspberry pi which is


2 of 2 people found this review helpful.

Amazing GPS receiver
Thursday, 6 February 2014  |  Erik

Need I say more? The best GPS receiver available. The external antenna connector is great! Also the Adafruit items have good support.I also ordered the external antenna and adapter but I did not need them indoors yet.


2 of 2 people found this review helpful.

ULTIMATE GPS.......ultimate for a good reason
Tuesday, 21 January 2014  |  Brian

Had 2 of these units so far as they are spot on. Compared to my expensive memory map and Sat map units the ultimate GPS acquires and locks onto satellites quicker than the more expensive units and also indoors something the memory map struggles with. Th


2 of 2 people found this review helpful.

I bought some more!
Wednesday, 15 January 2014  |  Stuart

These are great. Not much more to add from my previous review


2 of 2 people found this review helpful.

Fast and friendly service. Lowest cost in Europe (product plus p&p).
Thursday, 26 December 2013  |  Jos

This module fits an Akafugu VFD clock pin-for-pin on its base board. So, now I have a clock which knows where it is on Earth (duh) and runs absolutely right.


2 of 2 people found this review helpful.

What more could you want.
Friday, 13 December 2013  |  Stuart

This is a very well designed product. No silly RS232 adapters. Perfect for the Raspberry Pi. No need to use up one of your USB sockets.The optional external antenna socket is a nice touch.


2 of 2 people found this review helpful.

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