## Rate of Turn Indicator Advantage, SOLAS requirement

To ensure that the ship turns at a steady rate.

To ensure the number of degrees the ship will turn in a fixed period.

ROTI is a free gyro with only two degrees of freedom. Freedom to spin and tilt.

Formula, rate of turn= V/R * 57.3/60

SOLAS requirement

For ship 50000 gt and above.

Dial should be marked 0-60 degrees per minute on either side.

Dial should not be marked less than 0-30 degrees per minute on either side.

Use of ROTI

It can be used,

To ensure that the ship turns at a steady rate.

To ensure the number of degrees the ship will turn in a fixed period.

Incorporate with gyro

ROTI is a free gyro with only two degrees of freedom. Freedom to spin and tilt.

To turn a ship, ROTI is a very useful equipment.

Advantage

Ensure that the ship turns at a steady rate.

Easy to measure.

Effective in pilotage.

Help helmsman to steer.

Precautions

Is it operational

Are you going to monitor

Constant radius turn

Let Ship will go from A to B

Total course change= @°

Total distance AB= R@/57.3 mile

We know, distance= V * T

So, V T = R@/57.3

Or, T = R@/57.3V (time to cover the distance)

So, rate of turn @/T = 57.3V/R

Rate of turn= V/R

Therefore, for constant radius, relationship between V and ROT is established.