[Bigg Red]

If someone asks for map directions it is generally not a good idea to start talking about map datums and geodesics.

....

:)

[xone]

good idea to start talking about map datums

HOWEVER, if you have a map and a GPS, you better know something about map datums else your GPS is little better than a brick to hold your map in place. Ostensibly even the USAF learned that lesson in Serbia, depending who you ask.

Bad JDAMs!