Regulation 36 Records of calibration and verification
The master of every ship required to be fitted with a direction-finder installation shall cause the following records to be kept in a place accessible to any person operating the direction-finder, and to be available for inspection at any reasonable time by a surveyor of ships:
a list or diagram indicating the position, on the most recent occasion on which the direction-finder was calibrated, of the antennas and all moveable structures on board the ship which might affect the accuracy of the direction-finder;
the calibration tables and curves which were prepared on the most recent occasion on which the direction-finder was calibrated;
a certificate of calibration signed by the persons making the calibration relating to the most recent occasion on which the direction-finder was calibrated; and
a record, in the form specified in Schedule 2 to these Regulations, of checkbearings taken for the verification of calibration, the bearings being numbered in the order in which they were taken.