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Adafruit Ultimate GPS Breakout

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About this product


  • Develop interesting projects for the Arduino using GPS technology
  • Develop coding based applications for advanced projects
  • Highly sensitive receiver and wide channel give reliable GPS reception

Product overview

• Develop interesting projects for the Arduino using GPS technology
• Develop coding based applications for advanced projects
• Highly sensitive receiver and wide channel give reliable GPS reception
• -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
• >25Km altitude
• Internal patch antenna + u.FL connector for external active antenna
• Fix status LED

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.

We've tested this version of the Ultimate GPS in a high-altitude balloon, and it kept fix up to 27km!

A full tutorial is also available, which has tons of information about the module, how to use the data logger and more


Dimensions & Weight









Product Specifications


Open source



Pin Outs:


Operating Specifications






Package Contents:

1x Adafruit ultimate GPS breakout board
1x CR1220 coin cell holder
1x 9-pin header




Warranty Type:





Assembly Required:


Soldering Required:


I have a locator that requires a GPS input. Presently I am using a GPS device (pilot 3) which sends NMEA code into the locator. Will this device do this?

Asked by: Wilfsoft
The output signal details are as follows; Output: NMEA 0183, 9600 baud default Full details and a tutorial can be found at the following link; https://learn.adafruit.com/adafruit-ultimate-gps
Answered by: Gareth
Date published: 2016-06-14

what is the positional accuracy? i saw on the adafruit website it is 1.8m but is that + and - 1.8 or just 1.8?

Asked by: dev13
Position Accuracy: < 3 meters (all GPS technology has about 3m accuracy)
Answered by: Billy
Date published: 2015-10-26

What is the Voltage level of the PPS? Is it 5V?

Asked by: Angus
Full details can be found in the link below. https://learn.adafruit.com/adafruit-ultimate-gps
Answered by: Dominic
Date published: 2015-08-17

product desc says "Most GPS antennas use SMA connectors so you may want to pick up one of our uFL to SMA adapters. " - what is part # for that?

Asked by: AlanTechMan
On this occasion Maplin do not stock a product that exactly meets your requirements, or indeed anything close enough to offer you as an alternative
Answered by: Dominic
Date published: 2015-07-17

Can it be used as a very accurate time source rather than for location

Asked by: tom5678
The item is not designed for that, but as with all Arduino it is what you make it to be.
Answered by: Russell
Date published: 2015-07-17
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