Worksheet 473 · Skill 5

Set and drift

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1. At 0750 your fix is 281°T, 1.8 nm from Gannet Rock daybeacon. You steer 243°T at 5.7 kn through the water. At 0830 a new fix puts you 356°T, 2.8 nm from Mill stack.

   Plot the 0830 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 0925 your fix is 067°T, 1.0 nm from Westfield church spire. You steer 155°T at 6.6 kn through the water. At 1000 a new fix puts you 025°T, 1.2 nm from Heron Point Light.

   Plot the 1000 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 1430 your fix is 033°T, 2.1 nm from Gannet Rock daybeacon. You steer 309°T at 4.1 kn through the water. At 1505 a new fix puts you 060°T, 2.6 nm from Tern Island tower.

   Plot the 1505 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 0920 your fix is 105°T, 1.9 nm from Gannet Rock daybeacon. You steer 246°T at 8.4 kn through the water. At 0950 a new fix puts you 238°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 0950 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  

5. At 0750 your fix is 031°T, 2.0 nm from Mill stack. You steer 277°T at 9.0 kn through the water. At 0820 a new fix puts you 077°T, 1.0 nm from Heron Point Light.

   Plot the 0820 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 1145 your fix is 282°T, 3.9 nm from Tern Island tower. You steer 205°T at 8.5 kn through the water. At 1215 a new fix puts you 117°T, 2.1 nm from Westfield church spire.

   Plot the 1215 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  

7. At 1215 your fix is 007°T, 1.5 nm from Tern Island tower. You steer 105°T at 4.9 kn through the water. At 1315 a new fix puts you 061°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1315 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  

8. At 1225 your fix is 206°T, 2.2 nm from Tern Island tower. You steer 282°T at 4.2 kn through the water. At 1340 a new fix puts you 359°T, 2.3 nm from Westfield church spire.

   Plot the 1340 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