Worksheet 668 · Skill 5

Set and drift

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1. At 1600 your fix is 256°T, 2.2 nm from Gannet Rock daybeacon. You steer 339°T at 4.4 kn through the water. At 1630 a new fix puts you 215°T, 1.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1150 your fix is 014°T, 3.6 nm from Westfield church spire. You steer 102°T at 7.8 kn through the water. At 1240 a new fix puts you 021°T, 1.3 nm from Tern Island tower.

   Plot the 1240 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  

3. At 1315 your fix is 024°T, 2.1 nm from Tern Island tower. You steer 142°T at 6.7 kn through the water. At 1400 a new fix puts you 091°T, 2.0 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0830 your fix is 272°T, 3.5 nm from Tern Island tower. You steer 214°T at 4.2 kn through the water. At 0915 a new fix puts you 053°T, 2.2 nm from Heron Point Light.

   Plot the 0915 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 1500 your fix is 090°T, 2.1 nm from Westfield church spire. You steer 110°T at 7.1 kn through the water. At 1555 a new fix puts you 330°T, 2.8 nm from Kittle water tank.

   Plot the 1555 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0940 your fix is 237°T, 2.1 nm from Tern Island tower. You steer 240°T at 8.4 kn through the water. At 1010 a new fix puts you 039°T, 1.9 nm from Heron Point Light.

   Plot the 1010 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  

7. At 0835 your fix is 155°T, 1.8 nm from Westfield church spire. You steer 098°T at 8.3 kn through the water. At 0910 a new fix puts you 073°T, 2.4 nm from Heron Point Light.

   Plot the 0910 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 1010 your fix is 039°T, 1.4 nm from Gannet Rock daybeacon. You steer 250°T at 4.4 kn through the water. At 1110 a new fix puts you 263°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1110 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn