I currently have a Garmin 530HCX, love it, but thinking of upgrading to the Rino 655T. My son in-law is going to be hunting with me, and has no GPS so as an excuse to get a new one, I have to let him use my old one...right? Anyhow, can anybody tell me other than the radio what difference you might see with an Oregon 450t compared to the Rino 655t. I haven't ever held an Oregon or Montana, so I don't know what it displays look like. Is it 3-D mapping similar to the Birds eye view on the 655T? I want the tracking features and radio of the Rino, but the mapping looks better on the Oregon. An help appreciated.