A boat hook is part of boating equipment. Its most common use is as a docking and undocking aid. It may be similar to a pike pole, however it must have a blunt tip, for pushing during undocking, with a hook for docking. In addition, it may have a line attached to the other end, which may have a ring for this purpose.
It may be also used for pulling things out of water, such as debris or people, as well as for other fetching tasks.
Boat hook Wikipedia
In Royal Navy, during ceremonial occasions the Ceremonial Boat Hook Drill must be performed during berthing and unberthing.