As Garmin hasn't made any official announcement, we can't tell you when these sneaky handheld GPS navigators first showed up on the company's website, but say hello to the Oregon 600, 600t, 650 and 650t. Aesthetically, they all look identical, with a 3-inch "transflective color TFT touchscreen" in portrait orientation (240 x 400 resolution). Similarly, they share the overwhelming majority of internal specs, and all track your jaunts into the great outdoors using GPS and GLONASS. The only major differences w
