Compass calibration and other countries
NZ compass calibration requirements covered under Civil Aviation Rule 91.605(e) (5). And AC43-7 which lists the acceptable means of compliance as - 2 years
Canadian compass swing required under CAR standard 625 appendix C point 10 - 1 year
FAA - fairly typically no guidance provided HOWEVER aircraft is required to be in compliance with its type certification standard at completion of the annual inspection and type certification requirements FAR3, FAR23, require the compass to be accurate with errors of no more than 10 degrees. So technically annual should include a compass check - if not a full calibration.
So sorry dick but 27/09 has this one on the money.
It has occurred to me that the difference in compass swing requirements is more to do with the lack of navigational coverage in AUS as compared to the USA. WE have quite a few remote areas where 3 degrees of track can mean a long way from your destination. With little help from ATC