What is the difference between CAR and trecking GPS?

Hello;

I really would like to understand the difference between Car GPS and Trecking GPS. Are they similar?

I mean here from the point of syncing with satellites. I saw some trecking GPS that sync with 12 ( 12 channels). Does that mean that they are more sensitive than Car GPS?

Is it possible to use car GPS for trecking :-)

Or are there GPS that can be used for both applications at the same time, and may be also for sailing, let’s say :-)

If they are identical hardware-wise, does that mean one can use maps files for cars on a trecking GPS, or vice-versa?

Thank you in advance.

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