Worksheet 547 · Skill 5

Set and drift

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1. At 1240 your fix is 031°T, 2.9 nm from Heron Point Light. You steer 258°T at 4.2 kn through the water. At 1320 a new fix puts you 329°T, 1.3 nm from Heron Point Light.

   Plot the 1320 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 0800 your fix is 065°T, 2.2 nm from Heron Point Light. You steer 341°T at 5.0 kn through the water. At 0900 a new fix puts you 066°T, 1.9 nm from Westfield church spire.

   Plot the 0900 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  

3. At 0950 your fix is 030°T, 2.5 nm from Mill stack. You steer 300°T at 6.6 kn through the water. At 1025 a new fix puts you 007°T, 2.4 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1215 your fix is 006°T, 3.4 nm from Westfield church spire. You steer 124°T at 6.9 kn through the water. At 1320 a new fix puts you 006°T, 3.1 nm from Mill stack.

   Plot the 1320 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  

5. At 1350 your fix is 081°T, 2.1 nm from Tern Island tower. You steer 143°T at 4.0 kn through the water. At 1420 a new fix puts you 068°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1420 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 1040 your fix is 244°T, 2.4 nm from Gannet Rock daybeacon. You steer 050°T at 4.0 kn through the water. At 1115 a new fix puts you 213°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1115 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  

7. At 0750 your fix is 307°T, 3.2 nm from Tern Island tower. You steer 153°T at 4.4 kn through the water. At 0855 a new fix puts you 237°T, 3.5 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1220 your fix is 035°T, 2.3 nm from Mill stack. You steer 315°T at 7.9 kn through the water. At 1325 a new fix puts you 046°T, 1.7 nm from Westfield church spire.

   Plot the 1325 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