Increased understanding leads to
improved safety and more efficient waterways

Increased understanding leads to improved safety & more efficient waterways

Full-scale ship motion studies quantify actual vessel motions directly. They are essential in the validation of the numerical ship motion model on which underkeel clearance (UKC) requirements are based.

How do we do it?


Since 1997 OMC has pioneered the use of high accuracy Differential GPS (DGPS) systems in the measurement of vessel motions, including squat, heel, heave, roll and pitch.

By placing three DGPS receivers on the vessel, horizontal and vertical vessel motions and the location of the keel relative to the seabed can be determined to centimetre accuracy.


Where wave response (heave, roll and pitch) is the primary concern, OMC’s award-winning iHeave can be deployed. iHeave® is a simple to use and fully self-contained Inertial Measurement Unit (IMU) device with a custom assembly designed and built by OMC.

iHeave® can be mounted inside the bridge of a vessel by a pilot or port personnel with minimal effort. This device requires no additional cabling or connections on board.