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Very small tracker with GPS and 430MHz CW/RTTY radio beacon designed for High Altitude Baloons.
Based on ATMega328 @4MHz and powered from single AA Lithium 1.5 V cell Radio is RFM22 for 430 MHz.
PCB is designed for both versions.
GPS is uBLOX MAX-6G Module.

You need oreder antenna and GPS from HAB supplies.
All other parts are in the KIT.

Tracker send CW an RTTY messages.
You can find documentation https://github.com/ok1cdj/Picotracker.