Datasheet

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FAQ

Can my module do 40Km altitude? How can I know?

Modules shipped in 2013+ (and many in the later half of 2012) have firmware that has been

tested at 40km.

You can tell what firmware you have by sending the firmware query command $PMTK605*31

(you can use the echo demo to send custom sentences to your GPS)

If your module replies with AXN_2.10_3339_2012072601 5223 that means you have version

#5223 which is the 40KM version.

HOWEVER these modules are not specifically designed for high-altitude balloon use. People

have used them successfully but since we (at Adafruit) have not personally tested them for hi-alt

use, we have it as a bonus extra not as a specifically-designed hi-alt module.

How come I can't set the RTC with the Adafruit RTC library?

The real time clock in the GPS is NOT 'writable' or accessable otherwise from the Arduino. Its in

the GPS only! Once the battery is installed, and the GPS gets its first data reception from

satellites it will set the internal RTC. Then as long as the battery is installed, you can read the

time from the GPS as normal. Even without a proper "gps fix" the time will be correct.

The timezone cannot be changed, so you'll have to calculate local time based on UTC!