Worksheet 685 · Skill 5

Set and drift

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1. At 1530 your fix is 004°T, 1.8 nm from Mill stack. You steer 350°T at 4.9 kn through the water. At 1605 a new fix puts you 227°T, 2.8 nm from Tern Island tower.

   Plot the 1605 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  

2. At 1400 your fix is 071°T, 1.9 nm from Heron Point Light. You steer 297°T at 4.6 kn through the water. At 1440 a new fix puts you 130°T, 2.0 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1325 your fix is 064°T, 1.8 nm from Westfield church spire. You steer 148°T at 7.8 kn through the water. At 1405 a new fix puts you 355°T, 1.4 nm from Mill stack.

   Plot the 1405 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  

4. At 1140 your fix is 049°T, 3.8 nm from Gannet Rock daybeacon. You steer 243°T at 7.0 kn through the water. At 1255 a new fix puts you 096°T, 1.6 nm from Heron Point Light.

   Plot the 1255 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0755 your fix is 261°T, 2.5 nm from Gannet Rock daybeacon. You steer 049°T at 6.0 kn through the water. At 0830 a new fix puts you 003°T, 0.9 nm from Gannet Rock daybeacon.

   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 1335 your fix is 044°T, 2.1 nm from Westfield church spire. You steer 123°T at 6.3 kn through the water. At 1505 a new fix puts you 037°T, 1.5 nm from Mill stack.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0850 your fix is 316°T, 2.8 nm from Tern Island tower. You steer 208°T at 6.6 kn through the water. At 0935 a new fix puts you 032°T, 2.7 nm from Heron Point Light.

   Plot the 0935 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 1135 your fix is 038°T, 2.3 nm from Westfield church spire. You steer 117°T at 4.2 kn through the water. At 1245 a new fix puts you 267°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1245 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