I discovered a neat feature of the Hero 4 Black that I didn't realize I would be getting with the package. The camera can be set up as a dash cam that runs in a continual loop, overriding the older "footage" when the ram card runs out of room. These dash cam things seem to be very popular in Europe, and I can see where using one would be well worthwhile considering as helping in case of an accident to show what actually happened. Could save your butt in a case of your word against someone else's to determine liability.
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