Worksheet 670 · Skill 5

Set and drift

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1. At 0750 your fix is 111°T, 2.3 nm from Gannet Rock daybeacon. You steer 331°T at 5.5 kn through the water. At 0855 a new fix puts you 073°T, 1.7 nm from Tern Island tower.

   Plot the 0855 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  

2. At 1545 your fix is 025°T, 2.7 nm from Westfield church spire. You steer 143°T at 5.4 kn through the water. At 1705 a new fix puts you 050°T, 3.1 nm from Heron Point Light.

   Plot the 1705 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 0955 your fix is 038°T, 3.3 nm from Westfield church spire. You steer 123°T at 8.9 kn through the water. At 1045 a new fix puts you 149°T, 2.6 nm from Tern Island tower.

   Plot the 1045 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  

4. At 0800 your fix is 050°T, 4.2 nm from Westfield church spire. You steer 172°T at 4.8 kn through the water. At 0840 a new fix puts you 077°T, 2.8 nm from Westfield church spire.

   Plot the 0840 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 1250 your fix is 041°T, 1.1 nm from Kittle water tank. You steer 302°T at 6.8 kn through the water. At 1355 a new fix puts you 032°T, 3.2 nm from Heron Point Light.

   Plot the 1355 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  

6. At 1410 your fix is 021°T, 2.5 nm from Gannet Rock daybeacon. You steer 303°T at 5.0 kn through the water. At 1440 a new fix puts you 018°T, 2.3 nm from Tern Island tower.

   Plot the 1440 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 0805 your fix is 018°T, 2.6 nm from Westfield church spire. You steer 095°T at 5.0 kn through the water. At 0850 a new fix puts you 286°T, 3.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0820 your fix is 013°T, 3.5 nm from Westfield church spire. You steer 124°T at 4.2 kn through the water. At 0940 a new fix puts you 060°T, 3.3 nm from Heron Point Light.

   Plot the 0940 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