Worksheet 548 · Skill 5

Set and drift

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1. At 1345 your fix is 062°T, 4.4 nm from Tern Island tower. You steer 221°T at 4.6 kn through the water. At 1435 a new fix puts you 300°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1435 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  

2. At 1250 your fix is 359°T, 1.8 nm from Heron Point Light. You steer 024°T at 4.0 kn through the water. At 1320 a new fix puts you 096°T, 2.0 nm from Westfield church spire.

   Plot the 1320 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 0730 your fix is 267°T, 1.7 nm from Tern Island tower. You steer 165°T at 4.5 kn through the water. At 0815 a new fix puts you 218°T, 2.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1400 your fix is 280°T, 1.9 nm from Tern Island tower. You steer 256°T at 6.1 kn through the water. At 1430 a new fix puts you 054°T, 2.5 nm from Westfield church spire.

   Plot the 1430 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  

5. At 0720 your fix is 244°T, 2.7 nm from Gannet Rock daybeacon. You steer 087°T at 5.2 kn through the water. At 0755 a new fix puts you 121°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 0755 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  

6. At 0845 your fix is 283°T, 1.3 nm from Tern Island tower. You steer 233°T at 5.8 kn through the water. At 0935 a new fix puts you 006°T, 1.0 nm from Heron Point Light.

   Plot the 0935 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 1345 your fix is 303°T, 4.3 nm from Tern Island tower. You steer 097°T at 4.9 kn through the water. At 1450 a new fix puts you 002°T, 1.5 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1110 your fix is 071°T, 2.2 nm from Tern Island tower. You steer 293°T at 5.9 kn through the water. At 1145 a new fix puts you 358°T, 1.3 nm from Tern Island tower.

   Plot the 1145 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