Air ambulance jet pilot reported multiple navigation equipment failures and diverted to a nearby airport.

Narrative

Lost GPS/FMS long range Nav capabilities at night on climb out of ZZZZ 30;000 ft. to 40;000 feet. Autopilot also was inoperable; possibly due to loss of Nav. Received error messages 'heading ref fail/ADC input fail/400mhz ref fail/GPS 1 and 2 diff over 24NM/FMS diff over 24 NM and Position Uncertain' on the CDU. Center's controller asked if we were direct to ZZZ; I said I thought so but asked for a radar vector. This was after verifying our heading matched the compass. We then descended out of RVSM while hand flying. Now that I have had a chance to think about it; we could have been very far of course; that is why the controller asked if we were going direct; because we might not have been. We were able to get limited Nav capability by tuning in the VOR; but the DME didn't work on either pilot or copilot side. So we relied on radar vectors to a visual for the landing runway XX and landed uneventfully. Luckily our divert location; ZZZ; had nice weather. We originally on the way to ZZZ1. I did not declare an emergency because I was not requesting additional assistance (other than the vector) or having the fire trucks meet us on landing. Looking back on it; we should have declared an emergency in order to highlight ourselves. We did not have a patient on board. Since multiple; independent systems failed; an electrical problem could have caused this.