You do what for a living?
East-west involves changing longitude.
NOTE ITEMS http://www.freerepublic.com/focus/f-news/1787369/posts?page=27#27
WE HAD TO RUN NAV. SYSTEM IN OWN AIRCRAFT ---FOR VARICATION
OVER POLES AND -+ 180 DEGREES
It is very hard to understand how this could get out of the house
Not to mention max longitude is 180, not 190.
yeah yeah yeah. Operating keyboard before engaging brain....
[I'm always screwing up lat/lon (have to think of that book "Longitude" to keep them straight) but where did I come up with +-190???]