ROTI

INTRODUCTION:

         As per SOLAS 2000 Amendment Chapter V Regulation 19.2.9, it is mandatory for ships over 50,000 GRT to have a rate of turn indicator. IMO recommends that large alteration of courses have to be planned along circular tracks with wheel over point marked.

        The Rate of Turn Indicator (ROTI) is a device that indicates the instantaneous rate at which the ship is turning. It is fitted on ship as an independent fitment integrated with the steering gear/auto pilot.

CONSTANT RADIUS TURN:

In this method radius Radius is kept constant.

CONSTANT RATE TURN:

In this method ROT (/t) is kept constant.

WHEEL OVER POINT (WOP):

It is the point on initial course at which wheel is put over to initiate the turning of the vessel. It is

obtained by intersection of initial course by wheel over line.

The distance between the WOP and the ship commencing its turn is denoted by F and depends on:

 Size of vessel

 Loaded/ballast condition

 Trim

 Type of vessel etc.