Worksheet 923 · Skill 5

Set and drift

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1. At 0720 your fix is 077°T, 3.6 nm from Westfield church spire. You steer 118°T at 7.3 kn through the water. At 0805 a new fix puts you 346°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 0805 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  

2. At 0810 your fix is 261°T, 2.0 nm from Tern Island tower. You steer 280°T at 5.6 kn through the water. At 0850 a new fix puts you 050°T, 3.3 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1055 your fix is 023°T, 3.0 nm from Westfield church spire. You steer 142°T at 8.7 kn through the water. At 1125 a new fix puts you 238°T, 3.4 nm from Tern Island tower.

   Plot the 1125 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 1555 your fix is 064°T, 2.8 nm from Westfield church spire. You steer 096°T at 4.7 kn through the water. At 1630 a new fix puts you 282°T, 2.2 nm from Tern Island tower.

   Plot the 1630 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 0855 your fix is 050°T, 2.0 nm from Heron Point Light. You steer 115°T at 5.8 kn through the water. At 0935 a new fix puts you 203°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 0935 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 0820 your fix is 257°T, 2.0 nm from Gannet Rock daybeacon. You steer 039°T at 6.2 kn through the water. At 0915 a new fix puts you 044°T, 4.3 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  

7. At 0905 your fix is 258°T, 0.8 nm from Gannet Rock daybeacon. You steer 278°T at 5.6 kn through the water. At 1005 a new fix puts you 073°T, 2.0 nm from Heron Point Light.

   Plot the 1005 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  

8. At 1345 your fix is 002°T, 2.6 nm from Westfield church spire. You steer 090°T at 7.2 kn through the water. At 1510 a new fix puts you 069°T, 3.9 nm from Tern Island tower.

   Plot the 1510 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