Why no GPS Navigation Unit Aerials

Hello all,

Does anyone know why common GPS navigation units (TomTom) etc have no aerial? They have to be mounted 'bodily' where they can 'see' satellites, meaning the unit has to sit in the sun on top of the dash and is hard to see.

Why can't they have a wire aerial so the unit itself can be mounted in the dash?

This puzzles me??

Thanks Ian
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