Worksheet 406 · Skill 5

Set and drift

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1. At 1015 your fix is 353°T, 1.9 nm from Mill stack. You steer 331°T at 4.1 kn through the water. At 1105 a new fix puts you 097°T, 2.9 nm from Westfield church spire.

   Plot the 1105 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  

2. At 1155 your fix is 183°T, 1.9 nm from Tern Island tower. You steer 294°T at 5.6 kn through the water. At 1225 a new fix puts you 231°T, 3.1 nm from Tern Island tower.

   Plot the 1225 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 1315 your fix is 059°T, 1.5 nm from Heron Point Light. You steer 016°T at 7.7 kn through the water. At 1400 a new fix puts you 321°T, 3.0 nm from Tern Island tower.

   Plot the 1400 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  

4. At 1010 your fix is 326°T, 1.4 nm from Gannet Rock daybeacon. You steer 188°T at 5.7 kn through the water. At 1040 a new fix puts you 205°T, 1.8 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1315 your fix is 022°T, 2.6 nm from Westfield church spire. You steer 118°T at 5.3 kn through the water. At 1405 a new fix puts you 288°T, 1.5 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1045 your fix is 349°T, 2.4 nm from Mill stack. You steer 303°T at 5.0 kn through the water. At 1135 a new fix puts you 023°T, 2.0 nm from Heron Point Light.

   Plot the 1135 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 1150 your fix is 006°T, 1.8 nm from Kittle water tank. You steer 281°T at 8.7 kn through the water. At 1240 a new fix puts you 257°T, 3.6 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0750 your fix is 269°T, 2.1 nm from Tern Island tower. You steer 311°T at 4.0 kn through the water. At 0820 a new fix puts you 048°T, 4.0 nm from Westfield church spire.

   Plot the 0820 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