Worksheet 681 · Skill 5

Set and drift

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1. At 1455 your fix is 040°T, 2.1 nm from Gannet Rock daybeacon. You steer 263°T at 6.8 kn through the water. At 1540 a new fix puts you 204°T, 2.3 nm from Tern Island tower.

   Plot the 1540 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 1145 your fix is 315°T, 1.2 nm from Kittle water tank. You steer 358°T at 4.4 kn through the water. At 1255 a new fix puts you 090°T, 2.5 nm from Tern Island tower.

   Plot the 1255 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1345 your fix is 025°T, 2.3 nm from Gannet Rock daybeacon. You steer 247°T at 4.2 kn through the water. At 1500 a new fix puts you 186°T, 1.3 nm from Tern Island tower.

   Plot the 1500 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  

4. At 1440 your fix is 020°T, 2.5 nm from Tern Island tower. You steer 265°T at 4.5 kn through the water. At 1535 a new fix puts you 328°T, 2.0 nm from Tern Island tower.

   Plot the 1535 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 0845 your fix is 146°T, 2.6 nm from Tern Island tower. You steer 035°T at 5.6 kn through the water. At 0920 a new fix puts you 075°T, 4.1 nm from Tern Island tower.

   Plot the 0920 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 1015 your fix is 047°T, 3.8 nm from Gannet Rock daybeacon. You steer 247°T at 6.1 kn through the water. At 1055 a new fix puts you 286°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1055 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  

7. At 1125 your fix is 085°T, 3.3 nm from Westfield church spire. You steer 008°T at 5.5 kn through the water. At 1200 a new fix puts you 038°T, 4.0 nm from Westfield church spire.

   Plot the 1200 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 0700 your fix is 027°T, 2.2 nm from Heron Point Light. You steer 357°T at 5.7 kn through the water. At 0730 a new fix puts you 083°T, 2.8 nm from Westfield church spire.

   Plot the 0730 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