(Doug) wrote in
om:

I filed to a lat/long once. They accepted my flight plan,
but when the controller gave me my clearance, he did not
know how to call out my waypoint.

You had an inexperienced guy on clearance delivery. That's
where they seem to start out. Controllers who have some
experience seem to have no problems with lat/lon. ZHU certainly
has no problems with it, & HOU approach mostly knows about them,
but you still get a new guy once in awhile.

--
Regards,

Stan