Worksheet 275 · Skill 5

Set and drift

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1. At 0800 your fix is 304°T, 2.2 nm from Tern Island tower. You steer 226°T at 6.3 kn through the water. At 0845 a new fix puts you 045°T, 2.3 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1140 your fix is 221°T, 1.2 nm from Gannet Rock daybeacon. You steer 288°T at 5.6 kn through the water. At 1235 a new fix puts you 065°T, 3.8 nm from Westfield church spire.

   Plot the 1235 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  

3. At 1200 your fix is 259°T, 1.6 nm from Gannet Rock daybeacon. You steer 043°T at 9.0 kn through the water. At 1230 a new fix puts you 078°T, 2.8 nm from Tern Island tower.

   Plot the 1230 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 1430 your fix is 048°T, 0.8 nm from Heron Point Light. You steer 027°T at 5.1 kn through the water. At 1520 a new fix puts you 259°T, 3.2 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0705 your fix is 284°T, 1.2 nm from Gannet Rock daybeacon. You steer 275°T at 4.7 kn through the water. At 0830 a new fix puts you 080°T, 1.6 nm from Heron Point Light.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0830 your fix is 251°T, 3.1 nm from Tern Island tower. You steer 123°T at 5.6 kn through the water. At 0920 a new fix puts you 210°T, 2.1 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0830 your fix is 178°T, 0.9 nm from Gannet Rock daybeacon. You steer 312°T at 6.2 kn through the water. At 0900 a new fix puts you 232°T, 1.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0845 your fix is 214°T, 1.1 nm from Gannet Rock daybeacon. You steer 347°T at 4.0 kn through the water. At 0920 a new fix puts you 180°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