Worksheet 872 · Skill 5

Set and drift

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1. At 1515 your fix is 302°T, 3.8 nm from Tern Island tower. You steer 214°T at 5.9 kn through the water. At 1555 a new fix puts you 078°T, 1.1 nm from Westfield church spire.

   Plot the 1555 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  

2. At 1520 your fix is 247°T, 2.4 nm from Gannet Rock daybeacon. You steer 299°T at 4.1 kn through the water. At 1640 a new fix puts you 108°T, 1.2 nm from Westfield church spire.

   Plot the 1640 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  

3. At 0715 your fix is 078°T, 2.2 nm from Westfield church spire. You steer 164°T at 7.2 kn through the water. At 0750 a new fix puts you 337°T, 1.9 nm from Mill stack.

   Plot the 0750 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  

4. At 1305 your fix is 033°T, 3.5 nm from Westfield church spire. You steer 128°T at 8.5 kn through the water. At 1400 a new fix puts you 292°T, 1.2 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1440 your fix is 040°T, 2.4 nm from Kittle water tank. You steer 340°T at 5.4 kn through the water. At 1525 a new fix puts you 099°T, 1.9 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0830 your fix is 352°T, 3.4 nm from Mill stack. You steer 067°T at 8.7 kn through the water. At 0905 a new fix puts you 033°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 0905 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  

7. At 0710 your fix is 299°T, 4.6 nm from Tern Island tower. You steer 186°T at 6.8 kn through the water. At 0750 a new fix puts you 358°T, 1.6 nm from Heron Point Light.

   Plot the 0750 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  

8. At 0835 your fix is 107°T, 1.0 nm from Gannet Rock daybeacon. You steer 217°T at 4.0 kn through the water. At 0905 a new fix puts you 214°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0905 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