Have any of you been able to transfer files between a Mac and a Magellan GPS model explorist 400 or any similar model

This GPS has a File structure similar to a computer, it uses a USB connection to a PC and file transfering is like with any removable media, The GPS supports a SD card wich can also be read from the computer via de USB

The files are ASCII, everything indicates that a Mac should be able to transfer files with this GPS

Can somebody confirm this?