Ship-to-ship transfer of doctor or patient

The transfer of a doctor or patient between ships is a complex operation that requires a high level of seamanship skill to ensure safety and efficiency. While experienced seafarers are generally familiar with such procedures, this guidance may also be useful for less experienced operators such as yachtsmen or small craft handlers.

Large vessels, such as tankers, may require considerable time, sometimes up to 30 minutes or more, to prepare their engines for manoeuvring. Therefore, communication using daylight signalling equipment or VHF radio should be initiated as early as possible. Fully loaded large ships require several miles to reduce speed and are difficult to handle near smaller vessels. On the other hand, lighter ships and high-sided passenger vessels may drift significantly when stationary and must be approached carefully. In some cases, ships may need to keep their propellers moving slowly during the transfer operation.

It is important to avoid areas near the bow or stern overhangs, especially in rough sea conditions, as these can be dangerous. Attention should also be given to any fixed protective structures along the sides of the ship. Generally, the vessel with the higher freeboard will provide lighting and boarding arrangements and will indicate the safest position for transfer.

Once alongside, the smaller craft should not remain there longer than necessary. As soon as the transfer is complete, full power should be used to move away quickly and safely. There may be a suction effect that can hold the smaller vessel alongside, creating a dangerous situation if not handled properly. For safety, it is important to ensure visibility to the larger vessel and to clearly communicate all actions to its master, following instructions promptly and accurately.