Worksheet 787 · Skill 5

Set and drift

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1. At 0910 your fix is 010°T, 1.9 nm from Mill stack. You steer 085°T at 6.6 kn through the water. At 1000 a new fix puts you 096°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1000 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  

2. At 1345 your fix is 211°T, 1.6 nm from Gannet Rock daybeacon. You steer 294°T at 7.1 kn through the water. At 1420 a new fix puts you 033°T, 2.4 nm from Heron Point Light.

   Plot the 1420 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  

3. At 0920 your fix is 058°T, 2.5 nm from Gannet Rock daybeacon. You steer 223°T at 8.9 kn through the water. At 0955 a new fix puts you 059°T, 1.9 nm from Mill stack.

   Plot the 0955 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 1240 your fix is 051°T, 2.0 nm from Heron Point Light. You steer 067°T at 8.9 kn through the water. At 1330 a new fix puts you 097°T, 2.3 nm from Tern Island tower.

   Plot the 1330 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 0830 your fix is 020°T, 1.6 nm from Heron Point Light. You steer 038°T at 4.4 kn through the water. At 0900 a new fix puts you 252°T, 3.4 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 1330 your fix is 036°T, 1.4 nm from Westfield church spire. You steer 101°T at 6.2 kn through the water. At 1415 a new fix puts you 189°T, 1.5 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  

7. At 1330 your fix is 081°T, 2.8 nm from Tern Island tower. You steer 160°T at 6.9 kn through the water. At 1400 a new fix puts you 077°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1400 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 0855 your fix is 287°T, 3.5 nm from Tern Island tower. You steer 153°T at 8.3 kn through the water. At 0925 a new fix puts you 266°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 0925 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