Worksheet 586 · Skill 5

Set and drift

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1. At 0705 your fix is 017°T, 2.4 nm from Tern Island tower. You steer 125°T at 5.5 kn through the water. At 0735 a new fix puts you 029°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 0735 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 0925 your fix is 078°T, 1.9 nm from Gannet Rock daybeacon. You steer 334°T at 6.9 kn through the water. At 1000 a new fix puts you 042°T, 2.4 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1310 your fix is 047°T, 2.4 nm from Westfield church spire. You steer 057°T at 4.7 kn through the water. At 1340 a new fix puts you 304°T, 4.1 nm from Tern Island tower.

   Plot the 1340 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  

4. At 1600 your fix is 337°T, 1.8 nm from Mill stack. You steer 090°T at 6.7 kn through the water. At 1635 a new fix puts you 209°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1635 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  

5. At 1250 your fix is 306°T, 0.8 nm from Gannet Rock daybeacon. You steer 289°T at 7.2 kn through the water. At 1335 a new fix puts you 248°T, 3.2 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1120 your fix is 295°T, 2.3 nm from Tern Island tower. You steer 165°T at 5.2 kn through the water. At 1200 a new fix puts you 223°T, 2.5 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0905 your fix is 078°T, 2.9 nm from Westfield church spire. You steer 102°T at 6.9 kn through the water. At 0940 a new fix puts you 248°T, 1.8 nm from Tern Island tower.

   Plot the 0940 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 0900 your fix is 317°T, 2.1 nm from Tern Island tower. You steer 238°T at 4.3 kn through the water. At 1015 a new fix puts you 030°T, 1.7 nm from Heron Point Light.

   Plot the 1015 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn