I searched for "compass error" on my Summit CD-ROM and got 11 hits, all
definitions except one that, when referring to radio installations, said
that the compass card had to be checked with radios both on and off, with
the max allowable deviation 10 degrees. I don't think that there are any
regs that speak directly to the situation you describe.

Bob Gardner

"Casey Wilson" N2310D @ gmail.com wrote in message
news:xQllg.2530$RU4.408@trnddc03...
My FARAIM is at my daughter's house and I can't find anything on the 'net
to answer my questions. Please indulge me....

Scenario:
1) line up with runway centerline[for my hypothetical, the runway is
dead nuts to the compass]
2) note compass heading
3) add/subtract compass card correction

Questions:
1) How much error is allowable between known heading and corrected
compass reading?
2) Does a significant error down the airplane as unworthy?
3) Where can I find applicable references?