Worksheet 254 · Skill 5

Set and drift

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1. At 1320 your fix is 020°T, 3.3 nm from Westfield church spire. You steer 097°T at 6.9 kn through the water. At 1435 a new fix puts you 045°T, 2.9 nm from Tern Island tower.

   Plot the 1435 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  

2. At 1435 your fix is 009°T, 2.5 nm from Heron Point Light. You steer 051°T at 4.9 kn through the water. At 1525 a new fix puts you 294°T, 1.3 nm from Tern Island tower.

   Plot the 1525 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  

3. At 1255 your fix is 327°T, 1.5 nm from Gannet Rock daybeacon. You steer 234°T at 4.3 kn through the water. At 1415 a new fix puts you 355°T, 1.4 nm from Mill stack.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1345 your fix is 100°T, 2.4 nm from Westfield church spire. You steer 054°T at 7.4 kn through the water. At 1440 a new fix puts you 334°T, 2.4 nm from Tern Island tower.

   Plot the 1440 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  

5. At 0755 your fix is 008°T, 3.6 nm from Westfield church spire. You steer 140°T at 4.3 kn through the water. At 0855 a new fix puts you 002°T, 1.7 nm from Heron Point Light.

   Plot the 0855 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  

6. At 1200 your fix is 148°T, 1.5 nm from Gannet Rock daybeacon. You steer 287°T at 8.3 kn through the water. At 1240 a new fix puts you 256°T, 3.2 nm from Tern Island tower.

   Plot the 1240 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  

7. At 1520 your fix is 033°T, 3.8 nm from Gannet Rock daybeacon. You steer 242°T at 7.5 kn through the water. At 1630 a new fix puts you 354°T, 3.1 nm from Mill stack.

   Plot the 1630 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 019°T, 2.1 nm from Gannet Rock daybeacon. You steer 211°T at 4.1 kn through the water. At 0830 a new fix puts you 249°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0830 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