As my dad is a passionate sailor, he has a few GPS units that I will most likely be able to borrow.

I'll probably be able to get my hands on his Garmin GPS-12, already a dated unit but it is able to output NMEA.

If somebody wants me to test an interface or develop an interface for it (software-wise), I'd be willing to help.

Unfortunately I do not have any experience with map-based routing, however.

Till