Worksheet 56 · Skill 5

Set and drift

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1. At 1205 your fix is 041°T, 4.7 nm from Westfield church spire. You steer 150°T at 6.8 kn through the water. At 1315 a new fix puts you 250°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1315 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  

2. At 0740 your fix is 007°T, 2.0 nm from Gannet Rock daybeacon. You steer 003°T at 5.9 kn through the water. At 0810 a new fix puts you 041°T, 2.3 nm from Tern Island tower.

   Plot the 0810 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1505 your fix is 002°T, 1.5 nm from Heron Point Light. You steer 121°T at 5.3 kn through the water. At 1535 a new fix puts you 324°T, 1.6 nm from Mill stack.

   Plot the 1535 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1525 your fix is 043°T, 4.1 nm from Westfield church spire. You steer 143°T at 4.6 kn through the water. At 1600 a new fix puts you 276°T, 2.4 nm from Tern Island tower.

   Plot the 1600 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 0925 your fix is 008°T, 2.2 nm from Heron Point Light. You steer 045°T at 4.3 kn through the water. At 1045 a new fix puts you 291°T, 3.0 nm from Tern Island tower.

   Plot the 1045 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0850 your fix is 048°T, 4.2 nm from Westfield church spire. You steer 136°T at 4.9 kn through the water. At 1000 a new fix puts you 050°T, 1.4 nm from Mill stack.

   Plot the 1000 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  

7. At 0845 your fix is 026°T, 2.9 nm from Gannet Rock daybeacon. You steer 296°T at 6.7 kn through the water. At 0920 a new fix puts you 353°T, 1.4 nm from Tern Island tower.

   Plot the 0920 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 1425 your fix is 252°T, 2.2 nm from Tern Island tower. You steer 235°T at 7.6 kn through the water. At 1455 a new fix puts you 323°T, 1.6 nm from Heron Point Light.

   Plot the 1455 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn