Hey, I quite forgot that it was possible to use a vehicle whatever without battery. But yes, I remember my old buzzbike years ago didn't have one either ;-)
What Rich says is correct: you don't need to regulate the amps. The device only draws as much as it consumes. I'm not so sure about the voltage though if the Garmin device regulates this by itself. It is quite easy to make sure the voltage is DC and does not exceed a defined limit with a bridge rectifier and a zener diode behind it with the correct voltage limit. Any electronic shop should be able to assist you.
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Only when we pause to wonder
do we go beyond the limits of our little lives.
(Rod McKuen)
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