Worksheet 494 · Skill 5

Set and drift

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1. At 0835 your fix is 352°T, 1.6 nm from Gannet Rock daybeacon. You steer 238°T at 4.5 kn through the water. At 0935 a new fix puts you 234°T, 3.4 nm from Tern Island tower.

   Plot the 0935 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  

2. At 1300 your fix is 038°T, 4.8 nm from Gannet Rock daybeacon. You steer 210°T at 4.3 kn through the water. At 1355 a new fix puts you 042°T, 2.2 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0740 your fix is 325°T, 2.0 nm from Tern Island tower. You steer 097°T at 7.6 kn through the water. At 0820 a new fix puts you 029°T, 2.8 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0740 your fix is 082°T, 1.9 nm from Heron Point Light. You steer 035°T at 7.6 kn through the water. At 0810 a new fix puts you 228°T, 1.3 nm from Tern Island tower.

   Plot the 0810 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 1140 your fix is 346°T, 1.6 nm from Kittle water tank. You steer 290°T at 9.0 kn through the water. At 1230 a new fix puts you 252°T, 3.1 nm from Tern Island tower.

   Plot the 1230 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  

6. At 1325 your fix is 040°T, 2.0 nm from Kittle water tank. You steer 285°T at 7.3 kn through the water. At 1445 a new fix puts you 019°T, 2.7 nm from Heron Point Light.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0715 your fix is 220°T, 2.5 nm from Tern Island tower. You steer 260°T at 8.8 kn through the water. At 0745 a new fix puts you 008°T, 1.6 nm from Heron Point Light.

   Plot the 0745 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 1045 your fix is 331°T, 2.6 nm from Kittle water tank. You steer 284°T at 5.5 kn through the water. At 1215 a new fix puts you 071°T, 2.5 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn