Old Mapsource, CS330 and Legend dont match.

I have been in and out of the GPS world for a few years. Never a technical user until now. I was always a point and shoot kinda guy.

I have an old version of MapSource I bougth in 2002, an etrex legend and a CS330.

The lat\lon on the CS330 and legend do not match mapsource.

I put mapsource and the legend in WG84/hddd.ddddd format, I could not find a way to verify the format of the CS330.

Is there something else I need to do? Mapsource data is old, I didnt think that the lat\lon would drift.

Any ideas?