Looking for a palm pda/gps that's mac compatible? HELP

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Does anyone know of a palm os based pda/gps unit, something similar to the Garmin iQue 3600 but mac compatible? I can't find anything. All the gps software I've tried on my treo 650 is just bad to say the least.

Thanks in advance for any assistance.

Link to iQue 3600 (http://www.garmin.com/products/iQue3600/)