Worksheet 525 · Skill 5

Set and drift

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1. At 1210 your fix is 069°T, 1.3 nm from Gannet Rock daybeacon. You steer 023°T at 5.4 kn through the water. At 1305 a new fix puts you 061°T, 4.7 nm from Tern Island tower.

   Plot the 1305 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 0810 your fix is 061°T, 2.9 nm from Westfield church spire. You steer 125°T at 8.3 kn through the water. At 0845 a new fix puts you 265°T, 2.3 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0735 your fix is 054°T, 3.3 nm from Heron Point Light. You steer 118°T at 4.3 kn through the water. At 0810 a new fix puts you 005°T, 2.6 nm from Mill stack.

   Plot the 0810 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  

4. At 0715 your fix is 267°T, 1.6 nm from Gannet Rock daybeacon. You steer 301°T at 6.7 kn through the water. At 0810 a new fix puts you 019°T, 2.8 nm from Westfield church spire.

   Plot the 0810 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  

5. At 0800 your fix is 146°T, 1.5 nm from Tern Island tower. You steer 241°T at 5.2 kn through the water. At 0840 a new fix puts you 019°T, 2.4 nm from Mill stack.

   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  

6. At 1215 your fix is 007°T, 1.1 nm from Gannet Rock daybeacon. You steer 255°T at 4.7 kn through the water. At 1305 a new fix puts you 001°T, 2.7 nm from Mill stack.

   Plot the 1305 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  

7. At 0825 your fix is 269°T, 2.1 nm from Tern Island tower. You steer 206°T at 4.0 kn through the water. At 0855 a new fix puts you 250°T, 2.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1020 your fix is 064°T, 1.9 nm from Heron Point Light. You steer 330°T at 5.2 kn through the water. At 1120 a new fix puts you 060°T, 2.0 nm from Westfield church spire.

   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