On: Why does paper fold so well?

[rolph]

the really serious guys use GPS based equipment, and its serious stuff, being able to center up on a 1/64 inch brad tacked into the asphalt.

[that 50,000$ ufo on a tripod by the highway, dont try to steal one, man do they ever know exactly where they are]

yeah i like team yellow too :) the beam spread is what you want to check out if your serious about > 100 ft distance

https://www.gpsalaska.com/

^ this is a very commercial website, but example of higher end equipment and technique

[srean → rolph]

How do you calibrate the GPS

[rolph → srean]

there is a sattelite network, and a terrestrial reference station infra

[srean → rolph]

Yeah but how do we know there distances accurately