Worksheet 283 · Skill 5

Set and drift

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1. At 0900 your fix is 073°T, 2.3 nm from Heron Point Light. You steer 005°T at 6.5 kn through the water. At 0955 a new fix puts you 331°T, 2.0 nm from Tern Island tower.

   Plot the 0955 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  

2. At 1530 your fix is 177°T, 1.5 nm from Gannet Rock daybeacon. You steer 027°T at 4.4 kn through the water. At 1600 a new fix puts you 132°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1600 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  

3. At 0810 your fix is 313°T, 3.2 nm from Tern Island tower. You steer 267°T at 8.0 kn through the water. At 0840 a new fix puts you 007°T, 2.9 nm from Westfield church spire.

   Plot the 0840 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  

4. At 1600 your fix is 052°T, 3.3 nm from Heron Point Light. You steer 330°T at 5.0 kn through the water. At 1630 a new fix puts you 276°T, 3.2 nm from Tern Island tower.

   Plot the 1630 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 0830 your fix is 230°T, 2.4 nm from Gannet Rock daybeacon. You steer 296°T at 4.6 kn through the water. At 0935 a new fix puts you 002°T, 1.9 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1135 your fix is 031°T, 2.5 nm from Tern Island tower. You steer 277°T at 5.8 kn through the water. At 1205 a new fix puts you 317°T, 2.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0950 your fix is 347°T, 1.3 nm from Kittle water tank. You steer 297°T at 8.7 kn through the water. At 1040 a new fix puts you 092°T, 2.0 nm from Westfield church spire.

   Plot the 1040 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  

8. At 1425 your fix is 241°T, 1.7 nm from Tern Island tower. You steer 357°T at 4.0 kn through the water. At 1455 a new fix puts you 304°T, 3.2 nm from Tern Island tower.

   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