Does the memory mount when the device is attached to a computer. In the past I have had sat nav systems off bikes, imaged them first then 'synced' it with the specific garmin software for that device in my case it was 'Garmin Training Centre', I then used that software for my analysis.
Once you are done retain a copy of the profile from windows app data or
Users/$user/Library/Application Support/Garmin/Training Centre/TrainingCentre.gtc' on a mac.
With this file you can re look at the data another time by reinjecting the profile rather than forensically restoring the device and doing it all over again everytime.
In my experience, when I 'synced' the data stayed on the device but I do not know if this is true of every device.
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