Worksheet 684 · Skill 5

Set and drift

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1. At 0815 your fix is 054°T, 1.6 nm from Tern Island tower. You steer 078°T at 4.7 kn through the water. At 0855 a new fix puts you 065°T, 4.0 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0700 your fix is 071°T, 5.0 nm from Tern Island tower. You steer 269°T at 4.9 kn through the water. At 0745 a new fix puts you 048°T, 2.9 nm from Tern Island tower.

   Plot the 0745 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 1055 your fix is 095°T, 1.5 nm from Heron Point Light. You steer 055°T at 4.6 kn through the water. At 1125 a new fix puts you 216°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 1110 your fix is 207°T, 2.1 nm from Tern Island tower. You steer 294°T at 8.6 kn through the water. At 1145 a new fix puts you 044°T, 2.9 nm from Westfield church spire.

   Plot the 1145 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 1050 your fix is 014°T, 2.8 nm from Mill stack. You steer 345°T at 4.5 kn through the water. At 1135 a new fix puts you 273°T, 3.2 nm from Tern Island tower.

   Plot the 1135 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  

6. At 1500 your fix is 221°T, 2.4 nm from Gannet Rock daybeacon. You steer 333°T at 7.6 kn through the water. At 1540 a new fix puts you 292°T, 3.0 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0830 your fix is 019°T, 2.5 nm from Mill stack. You steer 047°T at 4.8 kn through the water. At 0950 a new fix puts you 063°T, 5.6 nm from Tern Island tower.

   Plot the 0950 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1245 your fix is 252°T, 3.2 nm from Tern Island tower. You steer 135°T at 6.6 kn through the water. At 1320 a new fix puts you 221°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1320 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