Worksheet 508 · Skill 5

Set and drift

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1. At 1455 your fix is 077°T, 2.1 nm from Tern Island tower. You steer 153°T at 4.6 kn through the water. At 1530 a new fix puts you 045°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1530 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 1040 your fix is 087°T, 2.0 nm from Heron Point Light. You steer 005°T at 5.7 kn through the water. At 1130 a new fix puts you 047°T, 3.8 nm from Westfield church spire.

   Plot the 1130 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 1535 your fix is 350°T, 3.1 nm from Mill stack. You steer 306°T at 5.1 kn through the water. At 1605 a new fix puts you 084°T, 2.3 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0720 your fix is 302°T, 4.1 nm from Tern Island tower. You steer 237°T at 6.8 kn through the water. At 0750 a new fix puts you 029°T, 0.9 nm from Westfield church spire.

   Plot the 0750 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 1505 your fix is 085°T, 1.9 nm from Heron Point Light. You steer 116°T at 4.7 kn through the water. At 1535 a new fix puts you 018°T, 2.1 nm from Mill stack.

   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  

6. At 1110 your fix is 257°T, 2.7 nm from Tern Island tower. You steer 169°T at 6.1 kn through the water. At 1155 a new fix puts you 084°T, 2.1 nm from Heron Point Light.

   Plot the 1155 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  

7. At 0715 your fix is 102°T, 2.7 nm from Westfield church spire. You steer 326°T at 7.0 kn through the water. At 0745 a new fix puts you 020°T, 3.2 nm from Westfield church spire.

   Plot the 0745 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 1035 your fix is 097°T, 2.7 nm from Westfield church spire. You steer 116°T at 4.8 kn through the water. At 1105 a new fix puts you 221°T, 2.8 nm from Tern Island tower.

   Plot the 1105 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