Quiz - Skills & Environment - Determining Accurate Distances

[NothingClever]

Deleted for irrelevancy.

 

[CT-Rich]

Sorry, I don't follow. How is a whale carcass or a cannon a measuring device?
I understand that one might want to measure those two examples with something other than fin kicks, so arm spans might be reasonable, but I've never seen a cannon so long that it would take even a single arm span.....and how does one estimate "2/3 of an arm span" with any accuracy? How does one do arm spans on either object without touching and possible disturbing it? Sorry, I think arm spans are from another era, like standing on the bottom. Since more and more folks are carrying a small reel/spool attached to their SMB/DSMB these days, they an easily stretch out a piece of line, put a small slip knot in it, and measure that with a tape after the dive.

As opposed to a tape measured or a knotted string to measure small, finite objects, like a sunken boat, not really for navigation