The speaker on the X30 is pretty wimpy. I have an x30 hooked up with a Bluetooth GPS and the turn by turns coming over my car stereo via an adapter. I use an i.trek powered mount without built in speaker and it is bomb proof. I chose to go with a BT unit since I use the gps outside of my vehicle for geocaching. A 2GB SD card has plenty of room for all of my maps, so I never have to load more maps for a particular trip.
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