Worksheet 774 · Skill 5

Set and drift

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1. At 1405 your fix is 265°T, 3.1 nm from Tern Island tower. You steer 336°T at 4.7 kn through the water. At 1440 a new fix puts you 303°T, 4.6 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1410 your fix is 010°T, 1.6 nm from Tern Island tower. You steer 250°T at 5.0 kn through the water. At 1505 a new fix puts you 283°T, 3.3 nm from Tern Island tower.

   Plot the 1505 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  

3. At 1050 your fix is 001°T, 2.1 nm from Tern Island tower. You steer 254°T at 7.1 kn through the water. At 1125 a new fix puts you 292°T, 3.4 nm from Tern Island tower.

   Plot the 1125 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 1345 your fix is 210°T, 2.2 nm from Gannet Rock daybeacon. You steer 283°T at 7.8 kn through the water. At 1425 a new fix puts you 007°T, 1.9 nm from Heron Point Light.

   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  

5. At 1300 your fix is 063°T, 2.9 nm from Heron Point Light. You steer 359°T at 6.1 kn through the water. At 1330 a new fix puts you 268°T, 3.2 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1435 your fix is 014°T, 1.7 nm from Westfield church spire. You steer 085°T at 7.1 kn through the water. At 1510 a new fix puts you 292°T, 3.3 nm from Tern Island tower.

   Plot the 1510 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  

7. At 1420 your fix is 007°T, 2.3 nm from Heron Point Light. You steer 118°T at 4.7 kn through the water. At 1450 a new fix puts you 052°T, 3.2 nm from Heron Point Light.

   Plot the 1450 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 0815 your fix is 036°T, 4.1 nm from Gannet Rock daybeacon. You steer 208°T at 5.1 kn through the water. At 0915 a new fix puts you 095°T, 2.3 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn