Worksheet 439 · Skill 5

Set and drift

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1. At 1240 your fix is 061°T, 2.6 nm from Heron Point Light. You steer 298°T at 4.4 kn through the water. At 1310 a new fix puts you 028°T, 2.6 nm from Heron Point Light.

   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  

2. At 1250 your fix is 120°T, 2.2 nm from Westfield church spire. You steer 116°T at 4.7 kn through the water. At 1340 a new fix puts you 000°T, 3.4 nm from Mill stack.

   Plot the 1340 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  

3. At 0745 your fix is 163°T, 1.7 nm from Westfield church spire. You steer 084°T at 8.2 kn through the water. At 0855 a new fix puts you 114°T, 1.4 nm from Gannet Rock daybeacon.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0800 your fix is 347°T, 2.3 nm from Tern Island tower. You steer 103°T at 6.4 kn through the water. At 0830 a new fix puts you 042°T, 3.1 nm from Tern Island tower.

   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  

5. At 0755 your fix is 298°T, 2.2 nm from Tern Island tower. You steer 060°T at 4.8 kn through the water. At 0830 a new fix puts you 038°T, 1.9 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0830 your fix is 081°T, 2.3 nm from Tern Island tower. You steer 222°T at 5.0 kn through the water. At 0940 a new fix puts you 011°T, 1.7 nm from Mill stack.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1125 your fix is 279°T, 2.2 nm from Tern Island tower. You steer 179°T at 4.7 kn through the water. At 1210 a new fix puts you 231°T, 3.1 nm from Tern Island tower.

   Plot the 1210 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 1020 your fix is 029°T, 3.6 nm from Westfield church spire. You steer 172°T at 4.7 kn through the water. At 1120 a new fix puts you 030°T, 3.6 nm from Heron Point Light.

   Plot the 1120 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