Worksheet 377 · Skill 5

Set and drift

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1. At 0830 your fix is 055°T, 4.1 nm from Tern Island tower. You steer 235°T at 4.7 kn through the water. At 0900 a new fix puts you 039°T, 1.3 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0730 your fix is 310°T, 2.6 nm from Tern Island tower. You steer 206°T at 4.0 kn through the water. At 0855 a new fix puts you 071°T, 2.2 nm from Westfield church spire.

   Plot the 0855 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0900 your fix is 221°T, 2.6 nm from Gannet Rock daybeacon. You steer 073°T at 5.5 kn through the water. At 0935 a new fix puts you 160°T, 1.1 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0905 your fix is 035°T, 2.8 nm from Westfield church spire. You steer 137°T at 8.6 kn through the water. At 1005 a new fix puts you 221°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1005 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  

5. At 0930 your fix is 030°T, 2.0 nm from Gannet Rock daybeacon. You steer 346°T at 4.8 kn through the water. At 1005 a new fix puts you 045°T, 2.5 nm from Tern Island tower.

   Plot the 1005 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 0825 your fix is 079°T, 2.6 nm from Westfield church spire. You steer 142°T at 5.9 kn through the water. At 0915 a new fix puts you 211°T, 3.0 nm from Tern Island tower.

   Plot the 0915 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  

7. At 1425 your fix is 284°T, 2.0 nm from Tern Island tower. You steer 222°T at 5.7 kn through the water. At 1455 a new fix puts you 040°T, 3.2 nm from Heron Point Light.

   Plot the 1455 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 1135 your fix is 040°T, 4.5 nm from Gannet Rock daybeacon. You steer 204°T at 5.0 kn through the water. At 1240 a new fix puts you 316°T, 1.5 nm from Kittle water tank.

   Plot the 1240 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