I'm looking for some advice regarding my next purchase. I currently have a Garmin iQ3600 and have had it for almost 5 years. However, lately it has been acting up and I'm afraid it's on its last leg. I'd like to have a replacement ready since I rely heavily on its organizational software and more importantly on its GPS capabilities. I have absolutely NO sense of direction and it has been a God-send. Garmin has discontinued its iQ3600 but still supports its software and updates. I've looked on E-bay and I would be able to get a new iQ3600 if I wanted to. However, I've been doing some reading up on the Mio P550 but don't understand all the technical vocabulary. So, I'm looking for someone who knows both products and would be able to give me a comparison of the two and a recommendation. Anyone out there who can help? It would be greatly appreciated.