Worksheet 617 · Skill 5

Set and drift

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1. At 1335 your fix is 353°T, 1.8 nm from Tern Island tower. You steer 227°T at 6.1 kn through the water. At 1420 a new fix puts you 263°T, 3.2 nm from Tern Island tower.

   Plot the 1420 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 0900 your fix is 208°T, 2.4 nm from Tern Island tower. You steer 087°T at 4.4 kn through the water. At 0945 a new fix puts you 005°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0945 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  

3. At 1215 your fix is 283°T, 3.7 nm from Tern Island tower. You steer 188°T at 6.0 kn through the water. At 1310 a new fix puts you 069°T, 1.7 nm from Heron Point Light.

   Plot the 1310 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  

4. At 1550 your fix is 200°T, 2.2 nm from Tern Island tower. You steer 114°T at 8.3 kn through the water. At 1620 a new fix puts you 158°T, 0.9 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0855 your fix is 117°T, 1.1 nm from Westfield church spire. You steer 064°T at 7.0 kn through the water. At 0930 a new fix puts you 261°T, 1.6 nm from Tern Island tower.

   Plot the 0930 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  

6. At 1600 your fix is 202°T, 2.2 nm from Gannet Rock daybeacon. You steer 309°T at 6.4 kn through the water. At 1635 a new fix puts you 239°T, 2.5 nm from Tern Island tower.

   Plot the 1635 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  

7. At 1300 your fix is 035°T, 3.6 nm from Westfield church spire. You steer 180°T at 5.5 kn through the water. At 1335 a new fix puts you 096°T, 3.3 nm from Westfield church spire.

   Plot the 1335 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  

8. At 0720 your fix is 039°T, 4.2 nm from Westfield church spire. You steer 130°T at 5.7 kn through the water. At 0835 a new fix puts you 290°T, 1.9 nm from Kittle water tank.

   Plot the 0835 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