Worksheet 484 · Skill 5

Set and drift

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1. At 0850 your fix is 323°T, 2.0 nm from Mill stack. You steer 328°T at 6.3 kn through the water. At 0935 a new fix puts you 075°T, 1.3 nm from Westfield church spire.

   Plot the 0935 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 1330 your fix is 318°T, 2.4 nm from Tern Island tower. You steer 172°T at 5.6 kn through the water. At 1415 a new fix puts you 225°T, 2.2 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1505 your fix is 050°T, 3.6 nm from Westfield church spire. You steer 128°T at 7.1 kn through the water. At 1540 a new fix puts you 196°T, 1.8 nm from Tern Island tower.

   Plot the 1540 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 0955 your fix is 304°T, 2.5 nm from Tern Island tower. You steer 186°T at 4.5 kn through the water. At 1045 a new fix puts you 222°T, 3.0 nm from Tern Island tower.

   Plot the 1045 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 1535 your fix is 067°T, 2.3 nm from Gannet Rock daybeacon. You steer 015°T at 5.9 kn through the water. At 1615 a new fix puts you 068°T, 4.2 nm from Tern Island tower.

   Plot the 1615 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 1055 your fix is 008°T, 2.4 nm from Heron Point Light. You steer 053°T at 8.4 kn through the water. At 1140 a new fix puts you 314°T, 2.5 nm from Tern Island tower.

   Plot the 1140 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 1410 your fix is 300°T, 3.0 nm from Tern Island tower. You steer 094°T at 8.7 kn through the water. At 1440 a new fix puts you 049°T, 2.3 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1445 your fix is 032°T, 2.1 nm from Gannet Rock daybeacon. You steer 065°T at 4.1 kn through the water. At 1520 a new fix puts you 047°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1520 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