If a qualified compass adjuster is unavailable and the master considers it necessary then adjustments may be made by a person holding a Certificate of Competency (Deck Officer) Class 1 (Master Mariner). The compass must be re-adjusted by a qualified compass adjuster at the next available opportunity. (Para. 12, Annex 13 (Magnetic Compasses) to the MCA’s SOLAS V 2002 publication)