Worksheet 450 · Skill 5

Set and drift

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1. At 1455 your fix is 031°T, 1.8 nm from Gannet Rock daybeacon. You steer 328°T at 5.2 kn through the water. At 1535 a new fix puts you 040°T, 2.4 nm from Tern Island tower.

   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  

2. At 1330 your fix is 042°T, 4.6 nm from Westfield church spire. You steer 118°T at 4.0 kn through the water. At 1420 a new fix puts you 014°T, 1.9 nm from Tern Island tower.

   Plot the 1420 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  

3. At 1520 your fix is 264°T, 2.6 nm from Tern Island tower. You steer 248°T at 4.8 kn through the water. At 1600 a new fix puts you 106°T, 1.0 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0730 your fix is 064°T, 1.6 nm from Westfield church spire. You steer 102°T at 8.7 kn through the water. At 0800 a new fix puts you 212°T, 1.4 nm from Tern Island tower.

   Plot the 0800 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 1025 your fix is 065°T, 2.4 nm from Westfield church spire. You steer 115°T at 6.4 kn through the water. At 1105 a new fix puts you 299°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1105 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 0710 your fix is 274°T, 2.8 nm from Tern Island tower. You steer 142°T at 5.9 kn through the water. At 0740 a new fix puts you 359°T, 3.2 nm from Mill stack.

   Plot the 0740 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 0900 your fix is 040°T, 3.1 nm from Westfield church spire. You steer 170°T at 6.3 kn through the water. At 0945 a new fix puts you 060°T, 1.4 nm from Heron Point Light.

   Plot the 0945 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  

8. At 0725 your fix is 207°T, 2.6 nm from Tern Island tower. You steer 073°T at 4.1 kn through the water. At 0805 a new fix puts you 159°T, 1.3 nm from Tern Island tower.

   Plot the 0805 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