Oaxaca Man

Can someone explain to me why my gps has so many map datum choices? Mine is set for WGS84. Under what circumstances would I want to change it to ... say NAD83, or any other?

Can I whooops again? I stand corrected. There was a WGS84 option in my primary so now they are both (primary and secondary) set there. Thanks for the imput.

Whoops. I guess that is WGS72 and WGS84. Sorry, I thought the "S" was a "5". But my point is the same.javascript:emoticon('')

Rgarding the options on the Sport Track Map Datum, I have two different WG options: Primary: WG 572 Secondary: WG 584 I selected them and it seems to work fine. But one commentor suggested that there should be WG 584 options for both Primary and Secondary. Mine doesn't ... but should it make that big a difference if I use the options listed above?

I am brand new to geocaching, but I've owned a Magellan Sport Trak unit for a couple of years and use it mainly when fishing in Canada and have been very satisfied with it. But, now that I want to use it for geocaching, I find it does not lead me to the cache coordinates posted. I thought at first it was a battery problem, so I put in new batteries. It didn't help. Yesterday I tried to locate a cache - but knew for certain I was way off (like a couple of blocks). I also tested it against a couple of bench marks and was still way off. For example, one BM was N 42 01.950 / W 091 35.933 and my gps read N 42 02.107 / W 091 35.882. (But I'm not sure BMs are all that accurate.) Today I tried again with a different unit, which did lead us to the cache area (although we were unable to find because of heavy snow). I know we were very close because of discription. Can anyone tell me what I might be doing wrong? Or could it be my Magellan? I have tried (unsuccessfully) to contact Magellan for their imput. I'd appreciate any suggestions. Oaxaca Man