Worksheet 166 · Skill 5

Set and drift

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1. At 1245 your fix is 253°T, 1.8 nm from Tern Island tower. You steer 141°T at 5.6 kn through the water. At 1340 a new fix puts you 226°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1340 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  

2. At 0720 your fix is 053°T, 3.9 nm from Westfield church spire. You steer 083°T at 9.0 kn through the water. At 0755 a new fix puts you 033°T, 2.9 nm from Tern Island tower.

   Plot the 0755 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 1215 your fix is 355°T, 1.9 nm from Tern Island tower. You steer 231°T at 8.3 kn through the water. At 1300 a new fix puts you 077°T, 2.0 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1040 your fix is 073°T, 1.8 nm from Heron Point Light. You steer 016°T at 4.5 kn through the water. At 1130 a new fix puts you 089°T, 3.1 nm from Westfield church spire.

   Plot the 1130 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  

5. At 0815 your fix is 017°T, 2.8 nm from Mill stack. You steer 351°T at 9.0 kn through the water. At 0850 a new fix puts you 318°T, 2.9 nm from Tern Island tower.

   Plot the 0850 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  

6. At 0915 your fix is 265°T, 3.6 nm from Tern Island tower. You steer 297°T at 4.4 kn through the water. At 1000 a new fix puts you 054°T, 2.2 nm from Westfield church spire.

   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 0855 your fix is 091°T, 1.3 nm from Gannet Rock daybeacon. You steer 243°T at 8.0 kn through the water. At 0930 a new fix puts you 052°T, 1.8 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0920 your fix is 071°T, 4.4 nm from Tern Island tower. You steer 203°T at 5.9 kn through the water. At 1010 a new fix puts you 028°T, 1.4 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn