Worksheet 25 · Skill 5

Set and drift

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1. At 0835 your fix is 037°T, 1.7 nm from Tern Island tower. You steer 264°T at 7.0 kn through the water. At 0910 a new fix puts you 310°T, 2.2 nm from Tern Island tower.

   Plot the 0910 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 1300 your fix is 031°T, 2.3 nm from Mill stack. You steer 095°T at 5.5 kn through the water. At 1400 a new fix puts you 018°T, 2.2 nm from Kittle water tank.

   Plot the 1400 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  

3. At 1235 your fix is 014°T, 2.3 nm from Mill stack. You steer 325°T at 4.7 kn through the water. At 1315 a new fix puts you 266°T, 3.6 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0900 your fix is 269°T, 3.6 nm from Tern Island tower. You steer 042°T at 6.4 kn through the water. At 0930 a new fix puts you 321°T, 2.4 nm from Tern Island tower.

   Plot the 0930 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 1300 your fix is 357°T, 1.8 nm from Heron Point Light. You steer 104°T at 5.5 kn through the water. At 1415 a new fix puts you 172°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1415 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0730 your fix is 233°T, 1.3 nm from Tern Island tower. You steer 206°T at 4.1 kn through the water. At 0800 a new fix puts you 211°T, 3.1 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  

7. At 1525 your fix is 250°T, 2.6 nm from Gannet Rock daybeacon. You steer 039°T at 4.3 kn through the water. At 1635 a new fix puts you 100°T, 1.9 nm from Tern Island tower.

   Plot the 1635 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0735 your fix is 289°T, 2.0 nm from Tern Island tower. You steer 276°T at 8.1 kn through the water. At 0815 a new fix puts you 010°T, 2.8 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn