Worksheet 434 · Skill 5

Set and drift

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1. At 1455 your fix is 027°T, 1.5 nm from Heron Point Light. You steer 079°T at 8.6 kn through the water. At 1525 a new fix puts you 266°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1525 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 1415 your fix is 079°T, 2.2 nm from Gannet Rock daybeacon. You steer 332°T at 5.5 kn through the water. At 1505 a new fix puts you 059°T, 3.6 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1505 your fix is 005°T, 1.1 nm from Heron Point Light. You steer 031°T at 5.2 kn through the water. At 1535 a new fix puts you 020°T, 2.4 nm from Heron Point Light.

   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  

4. At 0700 your fix is 185°T, 1.3 nm from Tern Island tower. You steer 219°T at 7.8 kn through the water. At 0730 a new fix puts you 077°T, 1.8 nm from Heron Point Light.

   Plot the 0730 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  

5. At 0725 your fix is 022°T, 2.3 nm from Tern Island tower. You steer 268°T at 4.8 kn through the water. At 0825 a new fix puts you 056°T, 3.9 nm from Westfield church spire.

   Plot the 0825 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  

6. At 0720 your fix is 071°T, 2.2 nm from Heron Point Light. You steer 349°T at 4.7 kn through the water. At 0810 a new fix puts you 035°T, 3.3 nm from Heron Point Light.

   Plot the 0810 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  

7. At 0840 your fix is 176°T, 1.2 nm from Tern Island tower. You steer 275°T at 7.8 kn through the water. At 0910 a new fix puts you 036°T, 3.4 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1025 your fix is 036°T, 4.5 nm from Gannet Rock daybeacon. You steer 271°T at 8.1 kn through the water. At 1125 a new fix puts you 045°T, 4.1 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn