Worksheet 900 · Skill 5

Set and drift

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1. At 1250 your fix is 300°T, 2.4 nm from Tern Island tower. You steer 191°T at 6.6 kn through the water. At 1330 a new fix puts you 039°T, 2.6 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1505 your fix is 020°T, 2.4 nm from Heron Point Light. You steer 320°T at 6.6 kn through the water. At 1535 a new fix puts you 023°T, 2.3 nm from Westfield church spire.

   Plot the 1535 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  

3. At 1345 your fix is 324°T, 1.4 nm from Kittle water tank. You steer 307°T at 5.1 kn through the water. At 1505 a new fix puts you 066°T, 3.1 nm from Westfield church spire.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1600 your fix is 294°T, 4.2 nm from Tern Island tower. You steer 137°T at 4.4 kn through the water. At 1700 a new fix puts you 222°T, 2.9 nm from Tern Island tower.

   Plot the 1700 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  

5. At 1345 your fix is 218°T, 2.0 nm from Tern Island tower. You steer 125°T at 7.1 kn through the water. At 1420 a new fix puts you 208°T, 0.8 nm from Gannet Rock daybeacon.

   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  

6. At 1530 your fix is 315°T, 1.3 nm from Gannet Rock daybeacon. You steer 080°T at 7.3 kn through the water. At 1600 a new fix puts you 066°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1600 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 0805 your fix is 261°T, 3.5 nm from Tern Island tower. You steer 168°T at 5.3 kn through the water. At 0845 a new fix puts you 080°T, 2.3 nm from Heron Point Light.

   Plot the 0845 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 0915 your fix is 045°T, 3.7 nm from Gannet Rock daybeacon. You steer 215°T at 7.6 kn through the water. At 1000 a new fix puts you 329°T, 0.9 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn