Worksheet 558 · Skill 5

Set and drift

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1. At 1125 your fix is 274°T, 2.7 nm from Tern Island tower. You steer 188°T at 4.4 kn through the water. At 1220 a new fix puts you 358°T, 3.2 nm from Mill stack.

   Plot the 1220 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  

2. At 1440 your fix is 200°T, 2.6 nm from Tern Island tower. You steer 227°T at 4.8 kn through the water. At 1515 a new fix puts you 343°T, 1.4 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0920 your fix is 033°T, 3.4 nm from Gannet Rock daybeacon. You steer 188°T at 5.1 kn through the water. At 0955 a new fix puts you 078°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 0955 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 0940 your fix is 023°T, 2.7 nm from Tern Island tower. You steer 143°T at 8.1 kn through the water. At 1015 a new fix puts you 055°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1015 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 0805 your fix is 074°T, 1.4 nm from Heron Point Light. You steer 074°T at 6.9 kn through the water. At 0845 a new fix puts you 223°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0845 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  

6. At 1455 your fix is 315°T, 2.1 nm from Tern Island tower. You steer 259°T at 5.1 kn through the water. At 1535 a new fix puts you 055°T, 3.7 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1555 your fix is 338°T, 2.7 nm from Tern Island tower. You steer 219°T at 8.8 kn through the water. At 1630 a new fix puts you 023°T, 2.5 nm from Heron Point Light.

   Plot the 1630 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 1430 your fix is 024°T, 1.0 nm from Westfield church spire. You steer 127°T at 8.4 kn through the water. At 1525 a new fix puts you 207°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1525 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