Worksheet 834 · Skill 5

Set and drift

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1. At 0730 your fix is 081°T, 2.2 nm from Heron Point Light. You steer 043°T at 5.3 kn through the water. At 0810 a new fix puts you 201°T, 2.1 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0725 your fix is 071°T, 2.7 nm from Heron Point Light. You steer 354°T at 5.4 kn through the water. At 0830 a new fix puts you 268°T, 2.8 nm from Tern Island tower.

   Plot the 0830 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0825 your fix is 254°T, 1.7 nm from Tern Island tower. You steer 289°T at 7.5 kn through the water. At 0900 a new fix puts you 008°T, 2.2 nm from Westfield church spire.

   Plot the 0900 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 0925 your fix is 023°T, 1.3 nm from Gannet Rock daybeacon. You steer 266°T at 6.4 kn through the water. At 1005 a new fix puts you 202°T, 2.8 nm from Tern Island tower.

   Plot the 1005 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  

5. At 1505 your fix is 175°T, 0.9 nm from Gannet Rock daybeacon. You steer 293°T at 5.4 kn through the water. At 1600 a new fix puts you 229°T, 3.1 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0735 your fix is 248°T, 1.0 nm from Gannet Rock daybeacon. You steer 104°T at 5.5 kn through the water. At 0815 a new fix puts you 109°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 0815 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 1355 your fix is 067°T, 3.1 nm from Gannet Rock daybeacon. You steer 295°T at 4.4 kn through the water. At 1445 a new fix puts you 122°T, 1.4 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1440 your fix is 054°T, 2.7 nm from Heron Point Light. You steer 079°T at 4.1 kn through the water. At 1520 a new fix puts you 302°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1520 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