On Apr 6, 2:37 am, wrote:
I was hoping to be able to find out the magnetic variation when doing
route planning prior to passages when i don't normally have the gps
turned on or hooked up to the computer. The variation is normally
stated on paper charts so I was thinking it should be somewhere on
cmap?

Kinda OT but you could try http://www.ngdc.noaa.gov/wist/magfield.jsp.
There are some other tools if you look around the area. There's also
horrible code which looks like it's been translated from FORTRAN to C
by robot if you want to roll you're own. I don't know what chart
software you are using to read your C-Map database but my feeling is
that the db itself doesn't include variation data unless there is an
anomaly. AFIK, most navigation programs that convert between T&M use
general code like the stuff NOAA gives away and they may or may not
provide a user interface for it.

-- Tom.