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Coach, read some of the reviews here at aximsite for some insight into GPS packages. Software for PDA's is often the same as in the cars, since the car manufacturers buy the software from the same vendors. For a wireless solution you should look for a BT receiver, powered mount (preferably with speaker and amplifier) and software that has an interface you like. You can get bundles at buygpsnow.com and semsons.com, among others.
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