Worksheet 886 · Skill 5

Set and drift

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1. At 1120 your fix is 023°T, 1.8 nm from Westfield church spire. You steer 120°T at 7.2 kn through the water. At 1220 a new fix puts you 279°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1220 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 1025 your fix is 158°T, 1.5 nm from Westfield church spire. You steer 094°T at 7.6 kn through the water. At 1105 a new fix puts you 357°T, 3.2 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1110 your fix is 252°T, 2.3 nm from Tern Island tower. You steer 289°T at 4.0 kn through the water. At 1205 a new fix puts you 037°T, 4.1 nm from Westfield church spire.

   Plot the 1205 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 1355 your fix is 229°T, 2.9 nm from Tern Island tower. You steer 272°T at 4.7 kn through the water. At 1430 a new fix puts you 004°T, 2.2 nm from Heron Point Light.

   Plot the 1430 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 1205 your fix is 205°T, 2.3 nm from Tern Island tower. You steer 065°T at 5.6 kn through the water. At 1240 a new fix puts you 120°T, 1.6 nm from Tern Island tower.

   Plot the 1240 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 0910 your fix is 327°T, 1.3 nm from Gannet Rock daybeacon. You steer 278°T at 8.0 kn through the water. At 0955 a new fix puts you 094°T, 2.7 nm from Westfield church spire.

   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  

7. At 0710 your fix is 031°T, 2.6 nm from Westfield church spire. You steer 113°T at 5.5 kn through the water. At 0825 a new fix puts you 043°T, 2.5 nm from Mill stack.

   Plot the 0825 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  

8. At 1140 your fix is 031°T, 1.5 nm from Gannet Rock daybeacon. You steer 112°T at 5.4 kn through the water. At 1210 a new fix puts you 090°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1210 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