Great run on Wednesday. But we lost the back marker at Strachan.
This caused a delay of about 15 minutes by the time someone turned back to check for a body and/or wreckage.
The following two groups stopped and confirmed that there were no signs of wreckage on the road.
The mirror system DID work but it delayed us in reaching our half way stop at Montrose AND delayed us further in returning to the Red Star.
If this happens again, it's quite simple, give a sign to the person in front, then we'll all know that the missing person--who's still missing-- is OK.