Posted: 19/09/2016 at 15:18
The problem was not that you were not carrying an ID but that the other person wasn't, and helpful friends erred on the safe side and reported that it could be you. Carrying a tag would not stop this false positive, it would only make sure you are identified in case of a true positive.
To cut down on false positives you could only post to fb when the track is finished, and anybody who clicked on the link could see you were in fact finished. Or you could use a device or app that has so called Live Tracking. Or you could just not post on fb and instead use a device or app that has a Beacon feature that gives a trusted person a link or sms to find out where you are. For really unknown or dangerous territory you could carry a locator such as a SPOT beacon.