It's probably the format you have it set to display degrees, minutes, and seconds. Most online mapping programs use just degrees and fractions, which is hddd.ddddd mode on the etrex. You probably have it set to degrees, minutes and fractions, hddd-mm.mmm' or even degrees, minutes, seconds: hddd-mm'ss.s"

I think that's on the system or settings menu on the etrex.

Anyways, you don't really want it to be too accurate. Anybody on the internet can see it. When I put mine in, it ended up right on my garage in the satellite view- I don't want everybody on the internet to know exactly where I live. Most people have been fudging their location a bit.