Worksheet 615 · Skill 5

Set and drift

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1. At 1250 your fix is 101°T, 2.8 nm from Westfield church spire. You steer 120°T at 7.9 kn through the water. At 1330 a new fix puts you 024°T, 2.6 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0910 your fix is 194°T, 1.7 nm from Gannet Rock daybeacon. You steer 286°T at 7.9 kn through the water. At 0955 a new fix puts you 083°T, 0.9 nm from Heron Point Light.

   Plot the 0955 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  

3. At 0930 your fix is 250°T, 0.8 nm from Gannet Rock daybeacon. You steer 274°T at 6.7 kn through the water. At 1025 a new fix puts you 064°T, 1.3 nm from Westfield church spire.

   Plot the 1025 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  

4. At 1300 your fix is 081°T, 2.6 nm from Westfield church spire. You steer 191°T at 4.6 kn through the water. At 1340 a new fix puts you 021°T, 1.0 nm from Heron Point Light.

   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  

5. At 0755 your fix is 323°T, 3.1 nm from Kittle water tank. You steer 282°T at 5.5 kn through the water. At 0915 a new fix puts you 053°T, 3.2 nm from Heron Point Light.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0825 your fix is 231°T, 1.5 nm from Gannet Rock daybeacon. You steer 323°T at 5.6 kn through the water. At 0920 a new fix puts you 297°T, 2.7 nm from Tern Island tower.

   Plot the 0920 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  

7. At 1450 your fix is 077°T, 2.9 nm from Tern Island tower. You steer 176°T at 6.4 kn through the water. At 1520 a new fix puts you 064°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1520 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 1455 your fix is 255°T, 1.4 nm from Tern Island tower. You steer 263°T at 5.3 kn through the water. At 1545 a new fix puts you 072°T, 1.3 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn