Worksheet 658 · Skill 5

Set and drift

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1. At 1455 your fix is 306°T, 2.7 nm from Tern Island tower. You steer 271°T at 6.3 kn through the water. At 1525 a new fix puts you 043°T, 3.4 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0905 your fix is 262°T, 3.4 nm from Tern Island tower. You steer 124°T at 6.8 kn through the water. At 0950 a new fix puts you 234°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0950 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  

3. At 0855 your fix is 228°T, 1.8 nm from Tern Island tower. You steer 142°T at 4.2 kn through the water. At 0950 a new fix puts you 238°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0950 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 1255 your fix is 113°T, 1.5 nm from Westfield church spire. You steer 086°T at 5.9 kn through the water. At 1335 a new fix puts you 228°T, 2.1 nm from Tern Island tower.

   Plot the 1335 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  

5. At 0830 your fix is 278°T, 2.9 nm from Tern Island tower. You steer 054°T at 6.1 kn through the water. At 0900 a new fix puts you 358°T, 2.1 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1315 your fix is 042°T, 2.2 nm from Mill stack. You steer 277°T at 4.0 kn through the water. At 1425 a new fix puts you 051°T, 1.7 nm from Heron Point Light.

   Plot the 1425 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  

7. At 1515 your fix is 178°T, 1.2 nm from Gannet Rock daybeacon. You steer 313°T at 4.6 kn through the water. At 1610 a new fix puts you 179°T, 1.1 nm from Tern Island tower.

   Plot the 1610 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 1130 your fix is 048°T, 3.4 nm from Heron Point Light. You steer 099°T at 5.1 kn through the water. At 1220 a new fix puts you 195°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1220 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