I've a pair of 650's bought here in Aus and there is no locality setting.
My understanding is the Garmin frequencies are normally fixed for any local version, look at the threads for the geofenced Astro for example. I couldnt see the 755 as being any different but have never played with one. In the current climate you may not get much help trying to play with newer device firmware. And operating on incorrect frequencies is obviously a serious issue.
Generally its more expensive to include the functionality and problematic in consumer space.
I do have some pro gade Icom marine VHF handhelds that do this but there is clearly a need for maritime travel, they are more expensive and users are less like to make mistakes or abuse e.g. here in Aus need to pass a test to obtain a user licence.
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