I have a Delorme PN-20 handheld GPS and a handlebar mount for my bike. The latest Delorme is the PN-60 and comes with a topo program and street maps for the whole country. I subscribe to their site for $30 per year and you can download any of USGS quad maps or color aerial photos to your computer. You can then download this maps/photos to the handheld for the area needed. Of course the screen is pretty small.