Karl, It is possible (although, I dont think too likely) that the coordinates could be off if your GPS is set to a different coordinate grid. To be compatible with the coords used in Geocaching, you need your GPS set to DD.MM.MMM (not degree, min, sec. as I think GPS's usually are set to when you start them up if you havent specified any other grid). I use two different coordinate grids with my GPS's. I use the metric grid in my aviation operations (hot air ballooning competitions). That is NAD27 /UTM. When I am out geocaching, of course, we use the WGS84 / DD.MM.MMM. I usually use different GPS's for each operation, but, I did take my aviation unit out geocaching one day and forgot to switch over the coordinate system and arrived at my destination many feet off. Never saw it over 300' off though. It was, however, sometimes over 50' off. That day I had simply uploaded a couple of caches into my aviation unit (the one set to NAD27/UTM) and, of course, they ended up being in the UTM coordinate grid. This was the only time I ever did that, so, don't know if they coords would typically be off like that or not. Myabe the cache coords were off originally. Something someone else might try one day. I use a Garmin 3+ pilot for ballooning and a Garmin Etrex Legend for geocaching. (I also have a Magellan 300 and a magellan Blazer 12 I would like to sell if anyone is interested). I dont see why a GPS would put the same location at different spots dependant upon which coordinate grid you are using. But, I have seen this before. Food for thought. In other words, if you punch in a geocache coordinate utilizing the DD.MM.MMM grid and then switch your GPS over to NAD27/UTM, would it be off when you arrived at the given spot? Has anyone else ever tried this and had this happen? I have thought about trying this to find a geocache in perhaps a very remote spot: I would punch in the coordinates (as geocaching.com gives them in DD.MM.MMM) and then switch the GPS over to NAD27/UTM. Now that I have done that, I can easily locate those coordinates on the 7.5' topo. The 7.5' topo utilizes the UTM 1000 meter grid. I 'grid' all my 7.5' topo maps to show 1000x1000 meter boxes. I then, break those boxes down into .10th using an overlaid grid on a clear film paper. This allows me to almost precisely find out where a cache is and thus, helping to plan my route into the cache location (something I didnt do on our first cache, Junk Drawer Junkie and ended up at the bottom of the canyon when there was a MUCH easier approach! Yep!). I utilize this type of planning in our hot air balloon competitions to find a target (and thus being able to plan our launch point to the target). We have never tried it caching, as we have always been able to just go at it by the GPS map. But, for those really remote caches, sometimes pre-planning an approach can make the hike to a cache alot easier. By placing the cache on the 7.5' topo, we can visually set up a route from the vehicle to the cache (thus potentially minimizing having to climb over a mountain when it would have been easier to go around, etc). Anyways, just some food for thought. Wondering if anyone else has arrived many feet off by switching the coordinate system in their GPS? Scott Nicol arizcowboy@hotmail.com Scotts Adventure Flying Web Page http://www.geocities.com/safwp _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com