Antenna Tomtom
Posted by admin on Wednesday Aug 10, 2011 Under GPS
I’d really like dealer installed NAV in my new car. Why are they cd driven & not satellite?
I heard if you get navigation “in dash” that it can only be updated by buying cd’s to load. The dash mounted types, Garmin, TomTom, receive satellite signals and are constantly updated. I really hate anything on my dash or stuck on the winshield. Why aren’t “in dash” kinds satellite driven too? I don’t understand why the same antenna that runs your satellite radio couldn’t run your nav too? Or maybe you can order one to be installed that is?
If not, how do you know how often to update, and are the cd’s expensive?
I think I see what you are asking, the satellites transmit a signal which your GPS interprets into a position and superimposes the position onto a built in database of maps, both systems whether built in or windshield mounted need to have their map database updated periodically, the new tom toms you can just hook them to your computer and update from their website. The built in models you need to buy CD’s. Your position is updated continuously, the maps you need to update yourself. Sat radio and GPS receive different signals so different antennas, on cars with factory antennas you don’t even see them.
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