by "Wilbur Hubbard" <wilburhubbard@[EMAIL PROTECTED]
>
May 17, 2008 at 11:44 AM
"TonyB" <hatt.j.bennett@[EMAIL PROTECTED]
> wrote in message
news:OuqdnR7tdafRU7PVnZ2dnUVZ8vWdnZ2d@[EMAIL PROTECTED]
> On my chart Imray G11 I have a compass rose which shows in writing
> "Variation 2º 45' E (2005) Increasing about 5' annually."
>
> Fine. But the compass rose points to 5º on the true north ring rather
than
> 2.45 - why is this?
>
> Thanks
> TonyB
There's something you've failed to consider - deviation. Deviation is a
local variance caused by metallic objects or electrical fields in or
around
the compass. You should swing your compass and derive a deviation table
for
every 10 or 15 degrees. Remember True Virgins Make Dull Companions.
http://acronyms.thefreedictionary.com/True+Virgins+Make+Dull+Companions+(mnemonic+for+navigation+formula)
Wilbur Hubbard
