Calling the Master The officer of the watch is to notify the Master immediately in the following circumstances: • If restricted visibility is encountered or expected; • If the traffic conditions or the movements of other ships are causing concern; If difficulty is experienced in maintaining course; On failure to sight land, a navigation mark or to obtain soundings by the expected time; If, unexpectedly, land or a navigation mark is sighted or change in sounding occurs; On the failure of the main engine, generating plant, steering gear or any essential navigational equipment; In heavy weather if in any doubt about the possibility of weather damage; If the ship meets any hazard to navigation, such as ice or derelicts; If oil is seen around the vessel from whatever source In the case of the O.O.W feeling fatigued or unwell and unable to continue a safe and efficient watch Any other circumstances as dictated by the Master's Standing orders In any other emergency or situation in which he is in any doubt • • • • • • • • • • Despite the requirement to notify the Master immediately in the foregoing circumstances, the O.O.W in addition must not hesitate to take immediate action for the safety of the ship, where circumstances so require