Worksheet 185 · Skill 5

Set and drift

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1. At 1120 your fix is 293°T, 3.8 nm from Tern Island tower. You steer 086°T at 6.6 kn through the water. At 1205 a new fix puts you 345°T, 1.2 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1255 your fix is 273°T, 1.8 nm from Tern Island tower. You steer 224°T at 4.8 kn through the water. At 1355 a new fix puts you 149°T, 1.5 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1055 your fix is 278°T, 3.5 nm from Tern Island tower. You steer 123°T at 6.3 kn through the water. At 1140 a new fix puts you 324°T, 2.8 nm from Kittle water tank.

   Plot the 1140 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  

4. At 0830 your fix is 029°T, 1.6 nm from Gannet Rock daybeacon. You steer 153°T at 6.9 kn through the water. At 0900 a new fix puts you 348°T, 1.1 nm from Kittle water tank.

   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  

5. At 1455 your fix is 347°T, 1.9 nm from Heron Point Light. You steer 124°T at 4.6 kn through the water. At 1525 a new fix puts you 056°T, 2.4 nm from Heron Point Light.

   Plot the 1525 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 0805 your fix is 062°T, 1.3 nm from Heron Point Light. You steer 033°T at 4.3 kn through the water. At 0900 a new fix puts you 212°T, 1.6 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0740 your fix is 235°T, 1.1 nm from Gannet Rock daybeacon. You steer 303°T at 7.5 kn through the water. At 0845 a new fix puts you 037°T, 2.1 nm from Westfield church spire.

   Plot the 0845 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 1435 your fix is 053°T, 3.7 nm from Gannet Rock daybeacon. You steer 260°T at 4.7 kn through the water. At 1530 a new fix puts you 273°T, 2.0 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn