But I don't know or can't find any info on what that "on board computer" is or does? Is it just a glorified calculator?
I don't have an 800, but my R12R has the OBC. It provides:
reading of ambient air temperature
reading of average speed (manually resettable)
reading of average fuel consumption (manually resettable)
reading of miles to empty (not resettable; computer restarts when one resets
average fuel consumption