Worksheet 182 · Skill 5

Set and drift

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1. At 1140 your fix is 332°T, 1.0 nm from Gannet Rock daybeacon. You steer 279°T at 4.6 kn through the water. At 1305 a new fix puts you 090°T, 3.5 nm from Westfield church spire.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0735 your fix is 092°T, 2.1 nm from Westfield church spire. You steer 102°T at 5.9 kn through the water. At 0820 a new fix puts you 217°T, 2.4 nm from Tern Island tower.

   Plot the 0820 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 0720 your fix is 091°T, 2.5 nm from Tern Island tower. You steer 228°T at 5.0 kn through the water. At 0810 a new fix puts you 009°T, 2.2 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0830 your fix is 066°T, 3.3 nm from Tern Island tower. You steer 278°T at 6.1 kn through the water. At 0920 a new fix puts you 310°T, 2.4 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0930 your fix is 026°T, 2.3 nm from Mill stack. You steer 299°T at 5.8 kn through the water. At 1010 a new fix puts you 256°T, 3.7 nm from Tern Island tower.

   Plot the 1010 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 0735 your fix is 021°T, 2.6 nm from Heron Point Light. You steer 325°T at 4.5 kn through the water. At 0805 a new fix puts you 060°T, 3.0 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1045 your fix is 025°T, 2.5 nm from Mill stack. You steer 356°T at 4.0 kn through the water. At 1120 a new fix puts you 212°T, 2.9 nm from Tern Island tower.

   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  

8. At 1025 your fix is 037°T, 2.5 nm from Gannet Rock daybeacon. You steer 249°T at 7.4 kn through the water. At 1105 a new fix puts you 224°T, 3.1 nm from Tern Island tower.

   Plot the 1105 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