A flag can come to your rescue in unknown ways.
The team had walked ahead that day, with the van following us later after picking up supplies. By 4.30 pm, there was no sign of the van. We found a good pasture for the camels and set up camp. The much touted satellite phone was not in the van, as the leader claimed. So all we could to was wait for the van to turn up and spot us.
A little later, we saw it at last, heading in our general direction, but not particularly towards us. Due to the desert heat, visibility is limited to not more than 2 km over a flat landscape. Out came the tent pole and the flag. I hoisted it high and waved madly to get the van's attention. Needless to say, it worked and we were sipping hot tea soon afterwards.