Worksheet 587 · Skill 5

Set and drift

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1. At 1200 your fix is 323°T, 1.5 nm from Tern Island tower. You steer 099°T at 4.4 kn through the water. At 1250 a new fix puts you 044°T, 1.5 nm from Tern Island tower.

   Plot the 1250 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  

2. At 1440 your fix is 182°T, 1.6 nm from Gannet Rock daybeacon. You steer 299°T at 4.0 kn through the water. At 1510 a new fix puts you 261°T, 1.2 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0900 your fix is 258°T, 3.2 nm from Tern Island tower. You steer 027°T at 4.8 kn through the water. At 0930 a new fix puts you 335°T, 1.9 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  

4. At 0815 your fix is 222°T, 3.1 nm from Tern Island tower. You steer 291°T at 6.4 kn through the water. At 0900 a new fix puts you 090°T, 2.0 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1220 your fix is 287°T, 3.1 nm from Tern Island tower. You steer 157°T at 7.8 kn through the water. At 1300 a new fix puts you 014°T, 2.8 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0730 your fix is 003°T, 3.3 nm from Mill stack. You steer 094°T at 4.2 kn through the water. At 0820 a new fix puts you 053°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0820 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  

7. At 0750 your fix is 295°T, 2.5 nm from Tern Island tower. You steer 243°T at 5.0 kn through the water. At 0845 a new fix puts you 078°T, 1.4 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0840 your fix is 336°T, 1.8 nm from Tern Island tower. You steer 238°T at 6.4 kn through the water. At 0910 a new fix puts you 255°T, 2.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn