Worksheet 730 · Skill 5

Set and drift

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1. At 1435 your fix is 172°T, 1.7 nm from Tern Island tower. You steer 094°T at 4.7 kn through the water. At 1510 a new fix puts you 130°T, 2.8 nm from Tern Island tower.

   Plot the 1510 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  

2. At 1030 your fix is 088°T, 1.7 nm from Heron Point Light. You steer 010°T at 7.7 kn through the water. At 1115 a new fix puts you 262°T, 3.1 nm from Tern Island tower.

   Plot the 1115 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  

3. At 1240 your fix is 070°T, 1.8 nm from Heron Point Light. You steer 037°T at 5.0 kn through the water. At 1315 a new fix puts you 263°T, 1.9 nm from Tern Island tower.

   Plot the 1315 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 0930 your fix is 102°T, 2.5 nm from Westfield church spire. You steer 118°T at 8.9 kn through the water. At 1010 a new fix puts you 227°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1010 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 1330 your fix is 321°T, 2.6 nm from Tern Island tower. You steer 264°T at 4.2 kn through the water. At 1430 a new fix puts you 034°T, 2.2 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0915 your fix is 300°T, 3.9 nm from Tern Island tower. You steer 220°T at 6.1 kn through the water. At 1000 a new fix puts you 010°T, 2.5 nm from Heron Point Light.

   Plot the 1000 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  

7. At 1555 your fix is 063°T, 4.9 nm from Tern Island tower. You steer 250°T at 4.1 kn through the water. At 1645 a new fix puts you 329°T, 1.7 nm from Tern Island tower.

   Plot the 1645 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 0935 your fix is 097°T, 3.0 nm from Westfield church spire. You steer 097°T at 5.2 kn through the water. At 1015 a new fix puts you 215°T, 1.5 nm from Tern Island tower.

   Plot the 1015 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