Worksheet 824 · Skill 5

Set and drift

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1. At 1555 your fix is 025°T, 2.2 nm from Kittle water tank. You steer 313°T at 6.6 kn through the water. At 1625 a new fix puts you 005°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1625 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  

2. At 1525 your fix is 050°T, 1.5 nm from Heron Point Light. You steer 019°T at 6.1 kn through the water. At 1600 a new fix puts you 271°T, 2.6 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0820 your fix is 043°T, 2.4 nm from Gannet Rock daybeacon. You steer 306°T at 4.2 kn through the water. At 0915 a new fix puts you 017°T, 2.5 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0735 your fix is 231°T, 2.4 nm from Tern Island tower. You steer 007°T at 5.9 kn through the water. At 0805 a new fix puts you 326°T, 1.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1420 your fix is 016°T, 1.3 nm from Tern Island tower. You steer 263°T at 5.7 kn through the water. At 1535 a new fix puts you 069°T, 2.2 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1200 your fix is 298°T, 1.8 nm from Tern Island tower. You steer 201°T at 4.6 kn through the water. At 1300 a new fix puts you 341°T, 1.9 nm from Mill stack.

   Plot the 1300 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  

7. At 0750 your fix is 057°T, 4.1 nm from Tern Island tower. You steer 210°T at 8.6 kn through the water. At 0835 a new fix puts you 229°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 0835 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 1325 your fix is 214°T, 2.0 nm from Tern Island tower. You steer 277°T at 6.1 kn through the water. At 1405 a new fix puts you 100°T, 1.6 nm from Westfield church spire.

   Plot the 1405 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