Worksheet 227 · Skill 5

Set and drift

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1. At 1545 your fix is 069°T, 3.1 nm from Gannet Rock daybeacon. You steer 004°T at 6.3 kn through the water. At 1615 a new fix puts you 037°T, 4.3 nm from Gannet Rock daybeacon.

   Plot the 1615 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  

2. At 1320 your fix is 028°T, 1.6 nm from Tern Island tower. You steer 134°T at 7.9 kn through the water. At 1355 a new fix puts you 106°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1355 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 0925 your fix is 048°T, 4.1 nm from Westfield church spire. You steer 181°T at 5.3 kn through the water. At 1015 a new fix puts you 003°T, 1.6 nm from Heron Point Light.

   Plot the 1015 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  

4. At 1430 your fix is 043°T, 1.1 nm from Heron Point Light. You steer 343°T at 6.6 kn through the water. At 1515 a new fix puts you 026°T, 1.4 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0825 your fix is 248°T, 2.1 nm from Gannet Rock daybeacon. You steer 029°T at 5.3 kn through the water. At 0915 a new fix puts you 094°T, 2.4 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0800 your fix is 098°T, 2.1 nm from Gannet Rock daybeacon. You steer 255°T at 7.5 kn through the water. At 0855 a new fix puts you 053°T, 1.1 nm from Heron Point Light.

   Plot the 0855 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 0915 your fix is 003°T, 2.7 nm from Westfield church spire. You steer 133°T at 5.2 kn through the water. At 0955 a new fix puts you 077°T, 1.8 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1215 your fix is 232°T, 1.6 nm from Tern Island tower. You steer 206°T at 5.0 kn through the water. At 1250 a new fix puts you 354°T, 2.6 nm from Mill stack.

   Plot the 1250 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