(Drew Dalgleish) writes:

A GPS knows where it is, not which way it is facing.

Do it while flying. The GPS know which way it's going.

Only by inference.
--
A host is a host from coast to
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433