In Google Maps it is possible to make a multi-point measurement. Even to the point that when the last click is on the same position as the first click, GM also gives the enclosed surface.

SH3D doesn't have either of these functions.

hmm. you give me idea for something completely different!

just recently, i was trying to measure how far i am running at the moment (i recently started again after 30 years), and you are right i think - i could use Google Maps to calculate. i use, but i never thought of that purpose.