3.1 Measurements should
be taken with the vessel proceeding ahead at a constant speed and
straight course in a depth of water not less than five times the draught.
3.2 Tests should be
conducted in sea conditions not greater than sea state 3 (slight).
3.3 The vessel should
be at a displacement and trim corresponding to a normal operating
condition.
3.4 Rudder angle variations
should be limited to ± 2° of the amidships position.