The built-in GPS capability records the locations you have been as well as tracking your speed, compass heading and speed camera locations as you mark them. No one expects to get into a driving accident, but when it happens, the built-in G-force sensor can detect these events and trigger Emergency Video Recording mode. These emergency recordings are date and time-stamped as well as protected from loop recording overwrites. The f310 records video clips of 3 or 5 minute lengths (customer selectable) on to the installed microSDHC memory card.The standard loop recording technology prevents storage overload by erasing the oldest previously recorded file and replacing it with the new one.