Worksheet 92 · Skill 5

Set and drift

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1. At 1525 your fix is 040°T, 4.1 nm from Gannet Rock daybeacon. You steer 231°T at 8.3 kn through the water. At 1610 a new fix puts you 260°T, 2.3 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1025 your fix is 175°T, 1.3 nm from Gannet Rock daybeacon. You steer 293°T at 6.0 kn through the water. At 1105 a new fix puts you 234°T, 1.8 nm from Tern Island tower.

   Plot the 1105 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  

3. At 0730 your fix is 077°T, 1.1 nm from Gannet Rock daybeacon. You steer 140°T at 4.0 kn through the water. At 0820 a new fix puts you 004°T, 1.8 nm from Kittle water tank.

   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  

4. At 1110 your fix is 100°T, 1.2 nm from Westfield church spire. You steer 090°T at 5.9 kn through the water. At 1200 a new fix puts you 208°T, 2.0 nm from Tern Island tower.

   Plot the 1200 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 0905 your fix is 076°T, 2.5 nm from Gannet Rock daybeacon. You steer 309°T at 5.5 kn through the water. At 0935 a new fix puts you 083°T, 2.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1415 your fix is 042°T, 2.7 nm from Tern Island tower. You steer 137°T at 4.1 kn through the water. At 1520 a new fix puts you 058°T, 2.9 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1345 your fix is 027°T, 2.7 nm from Mill stack. You steer 024°T at 4.1 kn through the water. At 1425 a new fix puts you 274°T, 0.9 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1545 your fix is 315°T, 1.9 nm from Tern Island tower. You steer 188°T at 6.2 kn through the water. At 1630 a new fix puts you 358°T, 3.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn