Bob, I use a Lowrance H2oc and love it. I use Mapcreate 7 and it shows very detail maps of my area. My only disappointment is that it is somewhat hard to see in very bright sunlight, but by tilting it away from the glare it is readable. You might want to check out Delorme. They have a unit that does street navigating, marine and topo if I'm not mistaken. You can also get sat photos that display your position. If I had not already invested in the H2oc I would be more than willing to give it a try. Check it out a www.delorme.com. Its called the Earthmate GPS PN-20. I have used delorme mapping and GPS receiver on my laptop since forever and love it. I just upgraded again to the 2009 version. As a final note, if someone would be willing to buy my Lowrance I'd gladly buy me one.
"gene"