Worksheet 285 · Skill 5

Set and drift

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1. At 1130 your fix is 047°T, 3.8 nm from Westfield church spire. You steer 178°T at 4.3 kn through the water. At 1225 a new fix puts you 244°T, 2.9 nm from Tern Island tower.

   Plot the 1225 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  

2. At 0805 your fix is 065°T, 4.9 nm from Tern Island tower. You steer 211°T at 8.0 kn through the water. At 0840 a new fix puts you 009°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 0840 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  

3. At 0720 your fix is 316°T, 2.9 nm from Tern Island tower. You steer 093°T at 8.0 kn through the water. At 0805 a new fix puts you 031°T, 3.9 nm from Gannet Rock daybeacon.

   Plot the 0805 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  

4. At 1415 your fix is 291°T, 2.9 nm from Tern Island tower. You steer 286°T at 4.5 kn through the water. At 1450 a new fix puts you 024°T, 3.6 nm from Westfield church spire.

   Plot the 1450 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  

5. At 1110 your fix is 356°T, 0.9 nm from Heron Point Light. You steer 099°T at 4.8 kn through the water. At 1150 a new fix puts you 020°T, 1.7 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1355 your fix is 052°T, 3.1 nm from Gannet Rock daybeacon. You steer 250°T at 4.0 kn through the water. At 1515 a new fix puts you 317°T, 1.9 nm from Mill stack.

   Plot the 1515 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  

7. At 0925 your fix is 250°T, 2.6 nm from Gannet Rock daybeacon. You steer 302°T at 5.6 kn through the water. At 1020 a new fix puts you 001°T, 2.2 nm from Heron Point Light.

   Plot the 1020 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  

8. At 0800 your fix is 093°T, 2.6 nm from Westfield church spire. You steer 103°T at 5.5 kn through the water. At 0905 a new fix puts you 194°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 0905 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn