Worksheet 175 · Skill 5

Set and drift

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1. At 1315 your fix is 243°T, 2.2 nm from Gannet Rock daybeacon. You steer 308°T at 5.6 kn through the water. At 1410 a new fix puts you 287°T, 3.9 nm from Tern Island tower.

   Plot the 1410 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 1140 your fix is 038°T, 2.4 nm from Gannet Rock daybeacon. You steer 039°T at 4.7 kn through the water. At 1215 a new fix puts you 040°T, 4.8 nm from Gannet Rock daybeacon.

   Plot the 1215 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  

3. At 1145 your fix is 016°T, 2.7 nm from Westfield church spire. You steer 088°T at 5.1 kn through the water. At 1245 a new fix puts you 312°T, 2.8 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1305 your fix is 132°T, 2.0 nm from Westfield church spire. You steer 011°T at 6.9 kn through the water. At 1345 a new fix puts you 031°T, 3.6 nm from Westfield church spire.

   Plot the 1345 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  

5. At 0850 your fix is 003°T, 2.5 nm from Mill stack. You steer 089°T at 8.1 kn through the water. At 0930 a new fix puts you 142°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 0930 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  

6. At 1210 your fix is 334°T, 1.7 nm from Mill stack. You steer 027°T at 6.0 kn through the water. At 1250 a new fix puts you 209°T, 1.9 nm from Tern Island tower.

   Plot the 1250 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 1205 your fix is 143°T, 1.4 nm from Westfield church spire. You steer 114°T at 8.6 kn through the water. At 1235 a new fix puts you 338°T, 1.9 nm from Mill stack.

   Plot the 1235 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  

8. At 1450 your fix is 039°T, 2.6 nm from Heron Point Light. You steer 104°T at 7.0 kn through the water. At 1530 a new fix puts you 241°T, 2.3 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn