Worksheet 657 · Skill 5

Set and drift

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1. At 1435 your fix is 117°T, 1.7 nm from Westfield church spire. You steer 116°T at 4.9 kn through the water. At 1515 a new fix puts you 101°T, 2.0 nm from Heron Point Light.

   Plot the 1515 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 1340 your fix is 250°T, 1.7 nm from Tern Island tower. You steer 185°T at 7.8 kn through the water. At 1415 a new fix puts you 340°T, 2.5 nm from Mill stack.

   Plot the 1415 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  

3. At 0750 your fix is 146°T, 1.2 nm from Westfield church spire. You steer 037°T at 7.2 kn through the water. At 0825 a new fix puts you 058°T, 3.9 nm from Westfield church spire.

   Plot the 0825 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  

4. At 1415 your fix is 011°T, 2.0 nm from Tern Island tower. You steer 280°T at 4.1 kn through the water. At 1450 a new fix puts you 327°T, 2.8 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0935 your fix is 327°T, 1.9 nm from Mill stack. You steer 061°T at 4.3 kn through the water. At 1030 a new fix puts you 234°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1030 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  

6. At 1410 your fix is 250°T, 1.6 nm from Tern Island tower. You steer 257°T at 6.4 kn through the water. At 1450 a new fix puts you 078°T, 2.3 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1410 your fix is 071°T, 2.2 nm from Tern Island tower. You steer 113°T at 4.2 kn through the water. At 1445 a new fix puts you 033°T, 3.9 nm from Gannet Rock daybeacon.

   Plot the 1445 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 1245 your fix is 065°T, 2.1 nm from Gannet Rock daybeacon. You steer 349°T at 5.4 kn through the water. At 1325 a new fix puts you 065°T, 3.6 nm from Tern Island tower.

   Plot the 1325 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