Worksheet 695 · Skill 5

Set and drift

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1. At 1255 your fix is 318°T, 1.3 nm from Gannet Rock daybeacon. You steer 047°T at 5.9 kn through the water. At 1345 a new fix puts you 037°T, 4.2 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1445 your fix is 052°T, 2.0 nm from Westfield church spire. You steer 116°T at 4.7 kn through the water. At 1545 a new fix puts you 265°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1545 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  

3. At 0820 your fix is 061°T, 1.8 nm from Westfield church spire. You steer 127°T at 7.3 kn through the water. At 0915 a new fix puts you 255°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 0915 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  

4. At 0730 your fix is 328°T, 2.1 nm from Mill stack. You steer 350°T at 7.7 kn through the water. At 0820 a new fix puts you 298°T, 4.0 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1105 your fix is 048°T, 1.6 nm from Westfield church spire. You steer 142°T at 5.3 kn through the water. At 1140 a new fix puts you 037°T, 3.6 nm from Heron Point Light.

   Plot the 1140 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  

6. At 0910 your fix is 044°T, 2.2 nm from Mill stack. You steer 068°T at 8.5 kn through the water. At 0945 a new fix puts you 080°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 0945 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 1430 your fix is 042°T, 3.6 nm from Westfield church spire. You steer 135°T at 6.5 kn through the water. At 1535 a new fix puts you 002°T, 3.2 nm from Mill stack.

   Plot the 1535 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  

8. At 0800 your fix is 215°T, 1.4 nm from Tern Island tower. You steer 245°T at 6.6 kn through the water. At 0830 a new fix puts you 063°T, 1.8 nm from Heron Point Light.

   Plot the 0830 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