Worksheet 709 · Skill 5

Set and drift

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1. At 1020 your fix is 258°T, 1.7 nm from Tern Island tower. You steer 188°T at 8.9 kn through the water. At 1050 a new fix puts you 013°T, 1.6 nm from Mill stack.

   Plot the 1050 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 1240 your fix is 310°T, 1.9 nm from Tern Island tower. You steer 072°T at 4.9 kn through the water. At 1310 a new fix puts you 011°T, 2.0 nm from Tern Island tower.

   Plot the 1310 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  

3. At 0740 your fix is 269°T, 1.8 nm from Tern Island tower. You steer 274°T at 4.1 kn through the water. At 0830 a new fix puts you 070°T, 3.6 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1450 your fix is 228°T, 3.4 nm from Tern Island tower. You steer 346°T at 9.0 kn through the water. At 1520 a new fix puts you 293°T, 4.2 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0740 your fix is 335°T, 1.9 nm from Mill stack. You steer 318°T at 4.9 kn through the water. At 0840 a new fix puts you 077°T, 3.4 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1405 your fix is 087°T, 3.6 nm from Westfield church spire. You steer 163°T at 4.2 kn through the water. At 1505 a new fix puts you 051°T, 2.4 nm from Heron Point Light.

   Plot the 1505 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  

7. At 0855 your fix is 197°T, 2.1 nm from Tern Island tower. You steer 285°T at 6.2 kn through the water. At 0925 a new fix puts you 092°T, 3.3 nm from Westfield church spire.

   Plot the 0925 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 1110 your fix is 091°T, 2.1 nm from Westfield church spire. You steer 090°T at 4.6 kn through the water. At 1205 a new fix puts you 155°T, 1.5 nm from Tern Island tower.

   Plot the 1205 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