Works on a bad link
Store and forward with delta compression. A day of telemetry is 4 MB.

Engine, fuel, bilge and cargo telemetry off the vessel over any link you have, including the bad one.
Store and forward with delta compression. A day of telemetry is 4 MB.
DNV and LR type approval for remote condition monitoring.
The default is silence. You are told when a limit is crossed, and only then.
Full historical export on request, in the raw sensor format, within 48 hours.