Worksheet 433 · Skill 5

Set and drift

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1. At 0810 your fix is 247°T, 1.2 nm from Gannet Rock daybeacon. You steer 039°T at 4.4 kn through the water. At 0905 a new fix puts you 038°T, 3.7 nm from Gannet Rock daybeacon.

   Plot the 0905 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 0715 your fix is 259°T, 1.9 nm from Gannet Rock daybeacon. You steer 322°T at 4.9 kn through the water. At 0800 a new fix puts you 237°T, 1.3 nm from Tern Island tower.

   Plot the 0800 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 0830 your fix is 216°T, 1.6 nm from Tern Island tower. You steer 238°T at 4.3 kn through the water. At 0935 a new fix puts you 078°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  

4. At 1450 your fix is 096°T, 2.8 nm from Westfield church spire. You steer 343°T at 4.5 kn through the water. At 1545 a new fix puts you 013°T, 3.7 nm from Westfield church spire.

   Plot the 1545 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  

5. At 0755 your fix is 192°T, 1.9 nm from Tern Island tower. You steer 250°T at 5.0 kn through the water. At 0825 a new fix puts you 050°T, 2.4 nm from Heron Point Light.

   Plot the 0825 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  

6. At 1400 your fix is 257°T, 0.8 nm from Gannet Rock daybeacon. You steer 039°T at 6.6 kn through the water. At 1430 a new fix puts you 027°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1430 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 1140 your fix is 264°T, 2.9 nm from Gannet Rock daybeacon. You steer 257°T at 4.0 kn through the water. At 1245 a new fix puts you 351°T, 1.9 nm from Heron Point Light.

   Plot the 1245 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  

8. At 1410 your fix is 049°T, 1.5 nm from Westfield church spire. You steer 114°T at 6.4 kn through the water. At 1530 a new fix puts you 149°T, 1.2 nm from Gannet Rock daybeacon.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn