The AC-Finder App

The App marks the last position of your action cam on a map and also makes a loud sound so you know it immediately wenn you lose it.
The position on the map is the position of your iPhone when the connection is lost. So you have a area to search for your lost cam.
The App supports all action cams witch have a wifi function AND have the feature to turn of the automatic standby. In the case the action cam goes into automatic standby you will have false positives in the alarms. Most vendors such as GoPro have this feature.