Worksheet 67 · Skill 5

Set and drift

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1. At 0855 your fix is 005°T, 2.6 nm from Westfield church spire. You steer 132°T at 4.1 kn through the water. At 1025 a new fix puts you 283°T, 3.9 nm from Tern Island tower.

   Plot the 1025 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1400 your fix is 232°T, 1.6 nm from Gannet Rock daybeacon. You steer 305°T at 4.9 kn through the water. At 1435 a new fix puts you 200°T, 2.1 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1340 your fix is 256°T, 1.9 nm from Tern Island tower. You steer 293°T at 6.6 kn through the water. At 1410 a new fix puts you 031°T, 2.9 nm from Westfield church spire.

   Plot the 1410 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 0950 your fix is 252°T, 1.2 nm from Gannet Rock daybeacon. You steer 255°T at 4.5 kn through the water. At 1040 a new fix puts you 044°T, 1.8 nm from Heron Point Light.

   Plot the 1040 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 1455 your fix is 033°T, 3.5 nm from Westfield church spire. You steer 104°T at 5.7 kn through the water. At 1540 a new fix puts you 332°T, 2.3 nm from Tern Island tower.

   Plot the 1540 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  

6. At 1415 your fix is 006°T, 1.5 nm from Gannet Rock daybeacon. You steer 222°T at 4.9 kn through the water. At 1445 a new fix puts you 233°T, 1.6 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0955 your fix is 058°T, 4.4 nm from Tern Island tower. You steer 220°T at 4.9 kn through the water. At 1120 a new fix puts you 031°T, 1.2 nm from Mill stack.

   Plot the 1120 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  

8. At 0845 your fix is 128°T, 1.3 nm from Westfield church spire. You steer 012°T at 7.1 kn through the water. At 0915 a new fix puts you 031°T, 3.8 nm from Westfield church spire.

   Plot the 0915 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