Worksheet 255 · Skill 5

Set and drift

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1. At 0800 your fix is 043°T, 2.1 nm from Tern Island tower. You steer 256°T at 6.1 kn through the water. At 0850 a new fix puts you 041°T, 3.2 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0840 your fix is 038°T, 3.7 nm from Westfield church spire. You steer 164°T at 8.6 kn through the water. At 0920 a new fix puts you 050°T, 1.9 nm from Heron Point Light.

   Plot the 0920 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 0915 your fix is 089°T, 2.6 nm from Westfield church spire. You steer 331°T at 5.6 kn through the water. At 0945 a new fix puts you 029°T, 3.3 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1340 your fix is 273°T, 1.0 nm from Gannet Rock daybeacon. You steer 064°T at 7.4 kn through the water. At 1410 a new fix puts you 030°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1410 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 1430 your fix is 017°T, 1.6 nm from Westfield church spire. You steer 140°T at 4.3 kn through the water. At 1555 a new fix puts you 056°T, 1.7 nm from Heron Point Light.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1030 your fix is 038°T, 2.8 nm from Heron Point Light. You steer 317°T at 8.1 kn through the water. At 1100 a new fix puts you 006°T, 2.5 nm from Westfield church spire.

   Plot the 1100 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 0800 your fix is 038°T, 3.8 nm from Westfield church spire. You steer 221°T at 4.6 kn through the water. At 0835 a new fix puts you 019°T, 1.8 nm from Westfield church spire.

   Plot the 0835 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 1015 your fix is 014°T, 1.5 nm from Heron Point Light. You steer 100°T at 8.0 kn through the water. At 1050 a new fix puts you 217°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1050 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