I too use a Nuvi 350 because I have it. Select off road when you get close and it guides you right to the coordinates. The sensitivity is as good or better than some handhelds.
I also have an old dinosaur Garmin GPS 12 (ancient). I use the Nuvi to drive to the trail head. I use the GPS 12 as a handheld on longer cache trails. I use it because I have it.