Jobless
Registered User
- Location
- Monroe, WA
Going to be down for a week and need to know where we can pick up a trail map (no, we don't have a GPS) on Sunday the 28th of May?
DevinB said:... but his GPS waypoints don't match up too well with Google Earth and the National Geographic topo software I have.
cruiseroutfit said:Really are you using the correct datum & projection? (NAD 17, NAD 83, WGS 84). You have to make sure your GPS, your computer, and your book are all referencing the same datum. I had that problem too before EZ Rhino set me straight.
mbryson said:Mine's been off a little with the book. I set the datum to what he had. I was within a couple hundred feet and I could find what he mentioned, but it was off.
I honestly can't remember. (I was gonna post that originally.) I think it was for Porcupine Rim. I would have fallen off the cliff if I was following his directions. I figured he's allowed to make a mistake or two. The trail was clearly marked and I was on it. His book did what it needed to do.cruiseroutfit said:Hmm, what trails?
He may have logged all his points before they loosened up the restrictions on GPS accuracy (thus his were properly done, just at an innaccurate era).
We used the GPS points almost exclusively to navigate our way through Flat Iron Mesa (one of the most confusing Moab trails), and I thought they were relatively close.
The way to do it is to GPS the actual trail and then match it against a Topo, though I have found even the topo's are of by 100+ feet. Could be the GPS, could be the topo software, hard to tell...
cruiseroutfit said:We used the GPS points almost exclusively to navigate our way through Flat Iron Mesa (one of the most confusing Moab trails), and I thought they were relatively close.
Unimog said:...before selective availability was turned off - at least in the issue I have...