Worksheet 783 · Skill 5

Set and drift

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1. At 0830 your fix is 022°T, 1.6 nm from Tern Island tower. You steer 081°T at 5.8 kn through the water. At 0905 a new fix puts you 071°T, 4.3 nm from Tern Island tower.

   Plot the 0905 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  

2. At 0900 your fix is 296°T, 1.6 nm from Tern Island tower. You steer 238°T at 4.8 kn through the water. At 0945 a new fix puts you 116°T, 1.3 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1235 your fix is 100°T, 3.0 nm from Westfield church spire. You steer 147°T at 8.6 kn through the water. At 1305 a new fix puts you 005°T, 1.2 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1205 your fix is 005°T, 3.3 nm from Mill stack. You steer 060°T at 6.0 kn through the water. At 1245 a new fix puts you 347°T, 1.6 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0930 your fix is 002°T, 1.0 nm from Gannet Rock daybeacon. You steer 071°T at 4.4 kn through the water. At 1005 a new fix puts you 044°T, 3.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0840 your fix is 353°T, 1.7 nm from Gannet Rock daybeacon. You steer 043°T at 5.5 kn through the water. At 0930 a new fix puts you 071°T, 3.9 nm from Tern Island tower.

   Plot the 0930 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 0925 your fix is 042°T, 2.5 nm from Mill stack. You steer 321°T at 8.9 kn through the water. At 1005 a new fix puts you 256°T, 2.9 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1440 your fix is 007°T, 0.9 nm from Heron Point Light. You steer 094°T at 4.3 kn through the water. At 1540 a new fix puts you 241°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1540 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