SPL is an open global satellite telemetry system for autonomous vehicles controlled by ArduPilot or PX4 autopilots that uses Iridium short burst data (ISBD) satellite communication technology provided by Rock Seven Mobile.
With SPL you can track, command, and control your solar powered boats, planes, blimps, and other autonomous vehicle from the other side of the Earth.
ISBD is a high latency, low bandwidth messaging technology, yet it is relatively inexpensive compared to other global communication solutions. The required hardware is very compact and lightweight.
See Envirover docs for the instructions on SPL installation and operation.