Worksheet 5 · Skill 5

Set and drift

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1. At 1150 your fix is 258°T, 3.6 nm from Tern Island tower. You steer 148°T at 5.6 kn through the water. At 1245 a new fix puts you 019°T, 2.7 nm from Mill stack.

   Plot the 1245 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  

2. At 1040 your fix is 283°T, 3.8 nm from Tern Island tower. You steer 086°T at 7.1 kn through the water. At 1130 a new fix puts you 028°T, 2.1 nm from Tern Island tower.

   Plot the 1130 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 1555 your fix is 269°T, 3.4 nm from Tern Island tower. You steer 174°T at 4.2 kn through the water. At 1635 a new fix puts you 047°T, 3.0 nm from Heron Point Light.

   Plot the 1635 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  

4. At 1045 your fix is 253°T, 2.0 nm from Tern Island tower. You steer 244°T at 7.4 kn through the water. At 1120 a new fix puts you 333°T, 1.8 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1420 your fix is 225°T, 1.6 nm from Tern Island tower. You steer 289°T at 4.2 kn through the water. At 1530 a new fix puts you 016°T, 1.8 nm from Westfield church spire.

   Plot the 1530 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  

6. At 0800 your fix is 035°T, 2.6 nm from Westfield church spire. You steer 143°T at 4.8 kn through the water. At 0845 a new fix puts you 243°T, 3.3 nm from Tern Island tower.

   Plot the 0845 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  

7. At 1305 your fix is 059°T, 1.7 nm from Heron Point Light. You steer 107°T at 4.8 kn through the water. At 1350 a new fix puts you 038°T, 1.5 nm from Mill stack.

   Plot the 1350 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 1015 your fix is 321°T, 3.1 nm from Tern Island tower. You steer 235°T at 4.0 kn through the water. At 1115 a new fix puts you 068°T, 3.4 nm from Westfield church spire.

   Plot the 1115 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