Boat instrument system for checking clearance between boat and overhead object, comprises measuring devices for height of boat and distance between water surface and object

摘要

A measuring device (2, 21) is used to calculate the height (A) of the boat (1) above the water surface (WS), another measuring device (11) is used to calculate the distance (B) between the overhead object (10) and the water surface (WS) and a processor (20) is used to determine whether there is sufficient clearance for the boat to pass safely beneath the object.