Worksheet 809 · Skill 5

Set and drift

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1. At 0815 your fix is 341°T, 2.8 nm from Kittle water tank. You steer 039°T at 5.2 kn through the water. At 0845 a new fix puts you 055°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 0845 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 0800 your fix is 202°T, 2.0 nm from Gannet Rock daybeacon. You steer 302°T at 8.0 kn through the water. At 0900 a new fix puts you 029°T, 3.4 nm from Westfield church spire.

   Plot the 0900 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 1300 your fix is 233°T, 3.2 nm from Tern Island tower. You steer 141°T at 4.8 kn through the water. At 1345 a new fix puts you 019°T, 1.0 nm from Mill stack.

   Plot the 1345 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  

4. At 1135 your fix is 014°T, 2.6 nm from Heron Point Light. You steer 013°T at 4.0 kn through the water. At 1205 a new fix puts you 088°T, 3.1 nm from Westfield church spire.

   Plot the 1205 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 0840 your fix is 059°T, 3.3 nm from Heron Point Light. You steer 353°T at 5.6 kn through the water. At 0930 a new fix puts you 274°T, 3.3 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1410 your fix is 052°T, 1.8 nm from Westfield church spire. You steer 116°T at 4.9 kn through the water. At 1530 a new fix puts you 228°T, 1.6 nm from Tern Island tower.

   Plot the 1530 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1515 your fix is 222°T, 3.4 nm from Tern Island tower. You steer 116°T at 5.2 kn through the water. At 1545 a new fix puts you 043°T, 2.4 nm from Mill stack.

   Plot the 1545 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  

8. At 0735 your fix is 343°T, 1.7 nm from Mill stack. You steer 341°T at 8.8 kn through the water. At 0815 a new fix puts you 294°T, 4.4 nm from Tern Island tower.

   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