Compass-1 (also known as Compass One) is a German amateur CubeSat picosatellite, built and operated in the late 2000s by Aachen University of Applied Science.

It was launched by the Indian Space Research Organisation, aboard a PSLV rocket as a secondary payload to the CartoSat-2A primary spacecraft[4] on 28 April 2008.

[6] Its primary mission is remote sensing; however, it also contains some technology demonstration experiments regarding the use of small satellites and GPS tracking.

[8] Mission objectives include: -Take color pictures in 640 by 480 resolution[9] -Validate a Phoenix GPS receiver[10] -Test a Magnetic Actuator based 3-axis gyroscope[11] There have been events that have been solved but remain to be explained, as Compass-1 has entered emergency mode and has undergone full resets a number of times.

After multiple tries, the Compass-1 team finally got enough charge retained in the batteries to boot the CubeSat and get a beacon and images back from the probe.