Worksheet 498 · Skill 5

Set and drift

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1. At 1050 your fix is 317°T, 3.2 nm from Tern Island tower. You steer 098°T at 6.5 kn through the water. At 1150 a new fix puts you 064°T, 3.6 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1525 your fix is 019°T, 2.3 nm from Westfield church spire. You steer 113°T at 7.5 kn through the water. At 1555 a new fix puts you 281°T, 2.9 nm from Tern Island tower.

   Plot the 1555 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  

3. At 1520 your fix is 238°T, 3.0 nm from Tern Island tower. You steer 150°T at 5.0 kn through the water. At 1550 a new fix puts you 032°T, 2.3 nm from Mill stack.

   Plot the 1550 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 1545 your fix is 058°T, 2.2 nm from Westfield church spire. You steer 146°T at 6.4 kn through the water. At 1635 a new fix puts you 328°T, 2.0 nm from Mill stack.

   Plot the 1635 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  

5. At 1535 your fix is 202°T, 2.4 nm from Tern Island tower. You steer 280°T at 5.9 kn through the water. At 1630 a new fix puts you 078°T, 2.6 nm from Westfield church spire.

   Plot the 1630 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0845 your fix is 221°T, 3.4 nm from Tern Island tower. You steer 070°T at 6.4 kn through the water. At 0915 a new fix puts you 173°T, 1.5 nm from Tern Island tower.

   Plot the 0915 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 1300 your fix is 257°T, 3.0 nm from Gannet Rock daybeacon. You steer 326°T at 5.9 kn through the water. At 1340 a new fix puts you 089°T, 3.6 nm from Westfield church spire.

   Plot the 1340 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  

8. At 0845 your fix is 338°T, 1.6 nm from Heron Point Light. You steer 023°T at 8.1 kn through the water. At 0915 a new fix puts you 062°T, 3.8 nm from Westfield church spire.

   Plot the 0915 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