Determine Wheel Over Point (WOP): 3 Methods for Accurate Ship Turns ll Rate of Turn (ROT)

[@nauticalacademy001]

Correction at Timestamp 6:38: The Reaction distance is incorrectly labeled. It should be labeled as the distance from the beginning of the turn (turning point), going back along the planned track to the wheel over point or wheel over line, and not from the turning point to the waypoint. Typically, the reaction distance is around the ship's length, but in some cases, it can be measured as 2 cables from the turn point, tracing back along the planned track to determine the wheel over point. Correction at Timestamp 11:17: The term "Reaction distance" is incorrect. It should simply be referred to as the distance from the waypoint, measured on both sides of the planned track, to determine the beginning of the turn (turning point) to the end of the turn.

[@NelsPreye]

Thank you sir for this. It's really educational and helpful.😊

[@nauticalacademy001]

Welcome.

[@sammykekisse]

Beautifully explained

[@nauticalacademy001]

Thank you.

[@Dmytro-l3o]

Immenesly thank you for your comprehensive explanation on this topic! Only one additional question I have as a beginner: what an actual rudder angle is mentioned under achievement of 1 nm Turning Radius? Maybe the more correct question: what rudder angle shall we put upon approaching a WOP to maintain a desired radius of turn, is it rudder full to required side or half?

[@nauticalacademy001]

Thank you for your kind words and great question! The rudder angle required to achieve a specific turning radius, like 1 nautical mile, depends on several factors such as the ship's speed, design, and loading condition. Generally, for large vessels, a rudder angle of around 10-20 degrees (also known as a "moderate" helm) might be sufficient to achieve a 1 NM turning radius. However, to be more precise, ships with advance turn prediction systems or ECDIS integrated autopilots often calculate the required rudder angle automatically. As a general practice, you may start with 10 degrees and adjust as needed. Using a full rudder might lead to a much sharper turn than intended, so it's advisable to start with moderate rudder and fine-tune during the turn. I hope this helps, and thanks again for watching!

[@Liquidish]

Actually I believe we can use ROT required to determine rudder angle. By knowing ship's behaviour and required ROT we can easily tell what rudder angle we may need. It is variable of course, but +-few degrees can be adjusted easily.

[@DK19914]

Sir how to Determine The Radius to be Used?

[@nauticalacademy001]

Usually, we refer to the ship's maneuvering characteristics found in the pilot card. However, if we want to maintain a constant safe distance around a reference point while turning, that distance from the reference point will serve as our radius.

[@rohangade8175]

@nauticalacademy001 what do u refer to in manoeuvring characteristics....could u give an example

[@johnmarkmanuelmagalona1984]

@@nauticalacademy001 Radius of Turn are half of the Final Diameter in the Turning Circle. Thus I put it as Radius of turn = Advance + Transfer based on the Turning circle of the vessel. Is my assumption correct sir?

[@jonifernuevas1283]

Point of clarification…Distance run along the turning radius from turning point to turning end point should be lesser than the reaction distances. Time run is calculated where the ship is traveling along the turning radius(dist run) . Reaction distance should be more than the distance run…😢

[@nauticalacademy001]

Thank you for the clarification.