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I know thats not the correct Category but its fits the best. I will buy some Garmin GPS Device and need someone who still own it and can help me with some question.
I am interest in the Montana "Series".
610 -> "Base Model"
680 -> with a Cam

680t -> Cam + more Storage

right?


What I want to do is recording my Position over many hours. The must work onboard an commercial Airliner and Trains (who goes up to 300kmh).
There must be an Antenna Port for an External Antenna (who the 610, 680,t have) to put the inside my Backpack and the Antenna outside for record.

 

From AT. :x

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