PC-Mobile used to sell a bluetooth adapter for older GPS units, and I have one that I used to use with my Legend. I had to make a cable with a 2.5mm stereo plug on one end, and a Garmin eTrex connector on the other. It worked, but it's a PITA, and I eventually just bought a bluetooth GPS receiver, which works much better. The Legend is rather old technology, and doesn't work nearly as well as a newer receiver. It's fine for carrying in the woods where it might get dropped in the water, but it has very low sensitivity and Garmins are a PITA to use with anything else. For about the same money you would spend to get the Legend working with the N800, you can get a much more capable bluetooth unit.