Worksheet 44 · Skill 5

Set and drift

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1. At 1445 your fix is 276°T, 0.8 nm from Gannet Rock daybeacon. You steer 210°T at 4.2 kn through the water. At 1515 a new fix puts you 278°T, 2.6 nm from Kittle water tank.

   Plot the 1515 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  

2. At 0810 your fix is 023°T, 1.8 nm from Westfield church spire. You steer 165°T at 5.7 kn through the water. At 0850 a new fix puts you 000°T, 1.8 nm from Heron Point Light.

   Plot the 0850 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 1400 your fix is 156°T, 1.8 nm from Westfield church spire. You steer 045°T at 4.2 kn through the water. At 1525 a new fix puts you 094°T, 3.2 nm from Westfield church spire.

   Plot the 1525 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1320 your fix is 233°T, 3.0 nm from Tern Island tower. You steer 345°T at 6.3 kn through the water. At 1400 a new fix puts you 305°T, 2.8 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1030 your fix is 146°T, 1.3 nm from Westfield church spire. You steer 123°T at 4.6 kn through the water. At 1145 a new fix puts you 220°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1145 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  

6. At 1240 your fix is 221°T, 1.9 nm from Gannet Rock daybeacon. You steer 299°T at 7.6 kn through the water. At 1310 a new fix puts you 229°T, 2.8 nm from Tern Island tower.

   Plot the 1310 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 0815 your fix is 022°T, 1.9 nm from Heron Point Light. You steer 011°T at 6.9 kn through the water. At 0850 a new fix puts you 048°T, 4.3 nm from Westfield church spire.

   Plot the 0850 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 0820 your fix is 344°T, 2.8 nm from Mill stack. You steer 085°T at 4.5 kn through the water. At 0930 a new fix puts you 290°T, 2.3 nm from Kittle water tank.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn