They have dead zones, but not like cell phones. GPS works off satellites so you theoretically can use them anywhere in the world. The problem is that if you don't have a clear view of the sky, your reception suffers. Deep canyons can give reflected signals, and heavy tree cover can really throw things off. Inside buildings can present a problem, but really, how often do you need to navigate around your house?
The E-Trex is particularly bad in this respect because it has a relatively weak internal antenna and apparently no way to rig up an external antenna. I still am dedicated to the e-trex, however. I've never had any serious problems. My accuracy goes from 10 feet to 20 or 30 feet sometimes. It's not like I can't find my way back to the truck or to the river. If I was blindfolded it might be a problem, but I rarely fish blindfolded... ----- Original Message ----- From: "Don Ordes" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, November 17, 2002 2:42 PM Subject: Re: [VFB] was Explorer, now MAPS, now GPS > Yes, Dan > I remember you well. Quit that lurking and join us. *G* > I am interested in GPS for flyfishing and ATV'n. > Will they work in canyon areas, or do they have dead zones like cell phones? > I'll contact you later on your email addy with some more questions. > DonO > >
