Worksheet 822 · Skill 5

Set and drift

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1. At 1500 your fix is 256°T, 2.8 nm from Gannet Rock daybeacon. You steer 025°T at 4.2 kn through the water. At 1530 a new fix puts you 197°T, 1.6 nm from Tern Island tower.

   Plot the 1530 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 1120 your fix is 002°T, 2.7 nm from Mill stack. You steer 316°T at 4.5 kn through the water. At 1200 a new fix puts you 092°T, 3.1 nm from Westfield church spire.

   Plot the 1200 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 1215 your fix is 224°T, 1.2 nm from Tern Island tower. You steer 275°T at 5.5 kn through the water. At 1305 a new fix puts you 045°T, 1.9 nm from Westfield church spire.

   Plot the 1305 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 1405 your fix is 133°T, 1.3 nm from Westfield church spire. You steer 026°T at 7.0 kn through the water. At 1445 a new fix puts you 297°T, 3.8 nm from Tern Island tower.

   Plot the 1445 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 1405 your fix is 282°T, 2.7 nm from Tern Island tower. You steer 277°T at 7.1 kn through the water. At 1445 a new fix puts you 031°T, 2.1 nm from Westfield church spire.

   Plot the 1445 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 1500 your fix is 345°T, 2.4 nm from Tern Island tower. You steer 247°T at 5.0 kn through the water. At 1620 a new fix puts you 080°T, 3.3 nm from Westfield church spire.

   Plot the 1620 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 0830 your fix is 078°T, 0.8 nm from Heron Point Light. You steer 042°T at 6.9 kn through the water. At 0900 a new fix puts you 219°T, 2.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1235 your fix is 042°T, 4.4 nm from Westfield church spire. You steer 094°T at 6.3 kn through the water. At 1350 a new fix puts you 042°T, 2.0 nm from Tern Island tower.

   Plot the 1350 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