I've been using a Lowrance i500 with a remote antena, I put the i500 in my tank bag, the external antenna is suction cupped onto my windscreen, plug the external sound into my communicator and just listen to the directions through my helmet speakers. It is big (bad news) but a tough unit that can take a good dunking under water and all the shaking you can dish out. The i500 comes with everything you will need so you dont have to run out and start buying things like mounts, however the external antennal is an option you will need it to use the i500 the way I do. It works great in the car and it works well on both my bikes (1000RR & K1200LT). Mapping is easy, by using way points you end up on motorcyle roads not highways. You also get compus, trip caculator, elevation and any other bell or whistle I've ever heard of on a GPS unit. The i500 has no batteries you wire it into your 12v system. Do not plan on using this unit mounted on the bike it's just too big, you want the directions not the visuals anyway. The i500 is being discontinued so you can get a unit for about $325 vs the $700 it sold for six month ago. The external antenna is about $75 if you shop it on line. In my opinion all the GPS units that are big enough too see while riding are just too big for a sport bike making this monster sized unit a good option. The unit does not have blue tooth (it has MP3 but I do not use it). I hook up my MP3, radar detector and GPS through my communicator so I'm not really interested in blue tooth. Works for me.