Worksheet 415 · Skill 5

Set and drift

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1. At 0725 your fix is 020°T, 1.9 nm from Westfield church spire. You steer 112°T at 5.5 kn through the water. At 0815 a new fix puts you 219°T, 2.6 nm from Tern Island tower.

   Plot the 0815 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  

2. At 1220 your fix is 020°T, 1.8 nm from Westfield church spire. You steer 112°T at 6.1 kn through the water. At 1330 a new fix puts you 155°T, 2.9 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1025 your fix is 039°T, 3.6 nm from Heron Point Light. You steer 116°T at 5.6 kn through the water. At 1100 a new fix puts you 226°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1100 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 1340 your fix is 213°T, 1.9 nm from Gannet Rock daybeacon. You steer 300°T at 8.2 kn through the water. At 1420 a new fix puts you 242°T, 3.6 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0945 your fix is 087°T, 2.2 nm from Westfield church spire. You steer 026°T at 4.7 kn through the water. At 1030 a new fix puts you 291°T, 4.0 nm from Tern Island tower.

   Plot the 1030 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 0735 your fix is 276°T, 1.3 nm from Gannet Rock daybeacon. You steer 261°T at 4.2 kn through the water. At 0840 a new fix puts you 027°T, 3.0 nm from Heron Point Light.

   Plot the 0840 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1150 your fix is 212°T, 1.8 nm from Tern Island tower. You steer 126°T at 5.6 kn through the water. At 1235 a new fix puts you 193°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1235 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  

8. At 0930 your fix is 033°T, 3.3 nm from Heron Point Light. You steer 136°T at 6.3 kn through the water. At 1010 a new fix puts you 220°T, 2.4 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn