Worksheet 559 · Skill 5

Set and drift

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1. At 1135 your fix is 008°T, 1.5 nm from Heron Point Light. You steer 099°T at 9.0 kn through the water. At 1205 a new fix puts you 255°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1205 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 1355 your fix is 027°T, 2.8 nm from Gannet Rock daybeacon. You steer 185°T at 4.1 kn through the water. At 1430 a new fix puts you 051°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1430 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 1350 your fix is 252°T, 3.6 nm from Tern Island tower. You steer 326°T at 4.8 kn through the water. At 1440 a new fix puts you 043°T, 2.9 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0935 your fix is 010°T, 1.0 nm from Westfield church spire. You steer 113°T at 5.2 kn through the water. At 1045 a new fix puts you 200°T, 2.3 nm from Tern Island tower.

   Plot the 1045 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1500 your fix is 345°T, 3.0 nm from Kittle water tank. You steer 347°T at 6.8 kn through the water. At 1545 a new fix puts you 065°T, 2.9 nm from Tern Island tower.

   Plot the 1545 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 1030 your fix is 077°T, 2.5 nm from Westfield church spire. You steer 096°T at 7.1 kn through the water. At 1105 a new fix puts you 169°T, 1.2 nm from Tern Island tower.

   Plot the 1105 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 1025 your fix is 282°T, 3.6 nm from Tern Island tower. You steer 123°T at 4.5 kn through the water. At 1135 a new fix puts you 241°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1135 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1150 your fix is 317°T, 2.4 nm from Tern Island tower. You steer 262°T at 5.7 kn through the water. At 1220 a new fix puts you 284°T, 3.7 nm from Tern Island tower.

   Plot the 1220 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