Worksheet 541 · Skill 5

Set and drift

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1. At 1325 your fix is 317°T, 1.4 nm from Tern Island tower. You steer 281°T at 6.6 kn through the water. At 1405 a new fix puts you 040°T, 2.6 nm from Westfield church spire.

   Plot the 1405 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0720 your fix is 312°T, 2.5 nm from Tern Island tower. You steer 224°T at 4.3 kn through the water. At 0835 a new fix puts you 040°T, 3.4 nm from Heron Point Light.

   Plot the 0835 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1405 your fix is 035°T, 1.7 nm from Heron Point Light. You steer 020°T at 4.0 kn through the water. At 1450 a new fix puts you 094°T, 3.3 nm from Westfield church spire.

   Plot the 1450 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1015 your fix is 071°T, 1.6 nm from Westfield church spire. You steer 067°T at 5.1 kn through the water. At 1125 a new fix puts you 308°T, 3.1 nm from Tern Island tower.

   Plot the 1125 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1115 your fix is 247°T, 2.4 nm from Tern Island tower. You steer 114°T at 5.1 kn through the water. At 1200 a new fix puts you 209°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1200 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1510 your fix is 021°T, 2.3 nm from Kittle water tank. You steer 270°T at 8.3 kn through the water. At 1605 a new fix puts you 039°T, 3.0 nm from Heron Point Light.

   Plot the 1605 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1000 your fix is 109°T, 1.6 nm from Tern Island tower. You steer 210°T at 4.2 kn through the water. At 1035 a new fix puts you 211°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1035 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1115 your fix is 033°T, 2.0 nm from Tern Island tower. You steer 164°T at 8.0 kn through the water. At 1200 a new fix puts you 003°T, 1.8 nm from Kittle water tank.

   Plot the 1200 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn