Finder-Man

I Have a Magellan Explorist GC Until Recently i have used it with Windows with no problem. We now have a Mac. when i plug the gps in it only lets me transfer one geocache at a time even though it tells me that the cache has been loaded when i check my gps it only has the first cache i moved!?? a friend told me to create a pocket query and move this to my gps. i've created a pocket query but have no idea to move it to my gps with a mac. can anyone help please? Thank You