Worksheet 133 · Skill 5

Set and drift

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1. At 1040 your fix is 066°T, 4.5 nm from Tern Island tower. You steer 159°T at 4.1 kn through the water. At 1110 a new fix puts you 034°T, 3.7 nm from Gannet Rock daybeacon.

   Plot the 1110 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 0955 your fix is 166°T, 1.5 nm from Tern Island tower. You steer 287°T at 4.4 kn through the water. At 1120 a new fix puts you 031°T, 2.6 nm from Westfield church spire.

   Plot the 1120 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1125 your fix is 224°T, 2.7 nm from Tern Island tower. You steer 197°T at 4.0 kn through the water. At 1200 a new fix puts you 339°T, 2.6 nm from Mill stack.

   Plot the 1200 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 1120 your fix is 013°T, 2.1 nm from Mill stack. You steer 075°T at 6.8 kn through the water. At 1150 a new fix puts you 153°T, 3.1 nm from Tern Island tower.

   Plot the 1150 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 0755 your fix is 034°T, 2.0 nm from Westfield church spire. You steer 145°T at 5.6 kn through the water. At 0830 a new fix puts you 019°T, 2.4 nm from Heron Point Light.

   Plot the 0830 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 1405 your fix is 027°T, 1.0 nm from Heron Point Light. You steer 078°T at 8.9 kn through the water. At 1435 a new fix puts you 277°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1435 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 0905 your fix is 092°T, 1.7 nm from Heron Point Light. You steer 074°T at 5.2 kn through the water. At 0940 a new fix puts you 253°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 0940 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  

8. At 1505 your fix is 348°T, 1.3 nm from Tern Island tower. You steer 086°T at 5.9 kn through the water. At 1545 a new fix puts you 033°T, 3.8 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn