Worksheet 713 · Skill 5

Set and drift

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1. At 1445 your fix is 040°T, 1.6 nm from Gannet Rock daybeacon. You steer 266°T at 8.7 kn through the water. At 1520 a new fix puts you 030°T, 3.4 nm from Heron Point Light.

   Plot the 1520 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  

2. At 1525 your fix is 053°T, 1.5 nm from Westfield church spire. You steer 068°T at 4.0 kn through the water. At 1645 a new fix puts you 303°T, 2.3 nm from Tern Island tower.

   Plot the 1645 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  

3. At 1425 your fix is 289°T, 3.7 nm from Tern Island tower. You steer 167°T at 4.6 kn through the water. At 1510 a new fix puts you 215°T, 3.4 nm from Tern Island tower.

   Plot the 1510 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 1340 your fix is 257°T, 1.9 nm from Gannet Rock daybeacon. You steer 101°T at 8.7 kn through the water. At 1410 a new fix puts you 042°T, 2.0 nm from Kittle water tank.

   Plot the 1410 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 0845 your fix is 214°T, 1.1 nm from Gannet Rock daybeacon. You steer 299°T at 4.9 kn through the water. At 0950 a new fix puts you 062°T, 2.4 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1020 your fix is 012°T, 1.6 nm from Tern Island tower. You steer 256°T at 4.5 kn through the water. At 1105 a new fix puts you 295°T, 3.7 nm from Tern Island tower.

   Plot the 1105 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  

7. At 1105 your fix is 224°T, 2.4 nm from Gannet Rock daybeacon. You steer 322°T at 5.2 kn through the water. At 1215 a new fix puts you 270°T, 3.4 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1500 your fix is 032°T, 2.0 nm from Heron Point Light. You steer 049°T at 6.3 kn through the water. At 1530 a new fix puts you 277°T, 2.2 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