Worksheet 43 · Skill 5

Set and drift

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1. At 1035 your fix is 055°T, 3.9 nm from Westfield church spire. You steer 130°T at 7.5 kn through the water. At 1120 a new fix puts you 263°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1120 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  

2. At 1145 your fix is 283°T, 3.9 nm from Tern Island tower. You steer 183°T at 4.9 kn through the water. At 1215 a new fix puts you 091°T, 3.3 nm from Westfield church spire.

   Plot the 1215 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 1510 your fix is 222°T, 1.9 nm from Tern Island tower. You steer 276°T at 8.2 kn through the water. At 1545 a new fix puts you 042°T, 2.2 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0805 your fix is 328°T, 1.5 nm from Tern Island tower. You steer 269°T at 8.0 kn through the water. At 0850 a new fix puts you 022°T, 2.2 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0825 your fix is 328°T, 1.8 nm from Heron Point Light. You steer 013°T at 6.3 kn through the water. At 0855 a new fix puts you 058°T, 2.4 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1540 your fix is 027°T, 2.2 nm from Tern Island tower. You steer 256°T at 4.6 kn through the water. At 1620 a new fix puts you 272°T, 3.0 nm from Tern Island tower.

   Plot the 1620 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 1020 your fix is 274°T, 3.5 nm from Tern Island tower. You steer 248°T at 4.4 kn through the water. At 1055 a new fix puts you 103°T, 1.7 nm from Westfield church spire.

   Plot the 1055 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 1410 your fix is 220°T, 2.6 nm from Tern Island tower. You steer 276°T at 7.5 kn through the water. At 1445 a new fix puts you 101°T, 1.0 nm from Westfield church spire.

   Plot the 1445 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