Worksheet 2 · Skill 5

Set and drift

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1. At 0845 your fix is 308°T, 3.7 nm from Tern Island tower. You steer 103°T at 8.7 kn through the water. At 0915 a new fix puts you 036°T, 1.8 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0755 your fix is 072°T, 3.0 nm from Gannet Rock daybeacon. You steer 275°T at 7.4 kn through the water. At 0850 a new fix puts you 214°T, 2.7 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1000 your fix is 328°T, 1.3 nm from Gannet Rock daybeacon. You steer 227°T at 4.9 kn through the water. At 1055 a new fix puts you 018°T, 1.4 nm from Mill stack.

   Plot the 1055 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  

4. At 0745 your fix is 245°T, 1.8 nm from Gannet Rock daybeacon. You steer 317°T at 8.5 kn through the water. At 0830 a new fix puts you 044°T, 2.2 nm from Westfield church spire.

   Plot the 0830 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  

5. At 1420 your fix is 015°T, 3.2 nm from Westfield church spire. You steer 122°T at 4.2 kn through the water. At 1520 a new fix puts you 216°T, 2.5 nm from Tern Island tower.

   Plot the 1520 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  

6. At 0825 your fix is 011°T, 1.7 nm from Kittle water tank. You steer 011°T at 4.3 kn through the water. At 0855 a new fix puts you 038°T, 1.6 nm from Gannet Rock daybeacon.

   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  

7. At 0855 your fix is 045°T, 3.5 nm from Heron Point Light. You steer 310°T at 8.5 kn through the water. At 0930 a new fix puts you 017°T, 1.9 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1530 your fix is 052°T, 4.0 nm from Tern Island tower. You steer 257°T at 4.9 kn through the water. At 1615 a new fix puts you 350°T, 2.0 nm from Tern Island tower.

   Plot the 1615 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