Worksheet 566 · Skill 5

Set and drift

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1. At 1245 your fix is 354°T, 1.6 nm from Kittle water tank. You steer 301°T at 8.0 kn through the water. At 1405 a new fix puts you 028°T, 3.6 nm from Westfield church spire.

   Plot the 1405 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  

2. At 1140 your fix is 291°T, 3.2 nm from Tern Island tower. You steer 156°T at 5.3 kn through the water. At 1220 a new fix puts you 199°T, 2.5 nm from Tern Island tower.

   Plot the 1220 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  

3. At 0845 your fix is 254°T, 3.3 nm from Tern Island tower. You steer 142°T at 8.9 kn through the water. At 0915 a new fix puts you 243°T, 2.1 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1050 your fix is 280°T, 2.7 nm from Tern Island tower. You steer 259°T at 5.2 kn through the water. At 1120 a new fix puts you 068°T, 2.9 nm from Westfield church spire.

   Plot the 1120 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 1125 your fix is 208°T, 2.6 nm from Tern Island tower. You steer 286°T at 6.9 kn through the water. At 1210 a new fix puts you 022°T, 1.3 nm from Westfield church spire.

   Plot the 1210 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  

6. At 1600 your fix is 256°T, 1.6 nm from Gannet Rock daybeacon. You steer 315°T at 4.7 kn through the water. At 1710 a new fix puts you 303°T, 4.6 nm from Tern Island tower.

   Plot the 1710 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  

7. At 1310 your fix is 095°T, 3.1 nm from Westfield church spire. You steer 106°T at 5.5 kn through the water. At 1415 a new fix puts you 223°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1415 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 0945 your fix is 210°T, 1.5 nm from Tern Island tower. You steer 280°T at 6.0 kn through the water. At 1015 a new fix puts you 031°T, 2.9 nm from Heron Point Light.

   Plot the 1015 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