Worksheet 791 · Skill 5

Set and drift

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1. At 0800 your fix is 259°T, 3.6 nm from Tern Island tower. You steer 172°T at 5.8 kn through the water. At 0840 a new fix puts you 059°T, 1.6 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1450 your fix is 242°T, 3.4 nm from Tern Island tower. You steer 094°T at 4.2 kn through the water. At 1555 a new fix puts you 013°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1555 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1545 your fix is 060°T, 1.8 nm from Gannet Rock daybeacon. You steer 181°T at 5.8 kn through the water. At 1615 a new fix puts you 119°T, 1.9 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1145 your fix is 101°T, 1.3 nm from Westfield church spire. You steer 060°T at 4.5 kn through the water. At 1230 a new fix puts you 286°T, 4.0 nm from Tern Island tower.

   Plot the 1230 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 1045 your fix is 297°T, 3.6 nm from Tern Island tower. You steer 173°T at 5.8 kn through the water. At 1140 a new fix puts you 073°T, 2.3 nm from Heron Point Light.

   Plot the 1140 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  

6. At 0725 your fix is 231°T, 3.5 nm from Tern Island tower. You steer 306°T at 8.8 kn through the water. At 0755 a new fix puts you 002°T, 1.9 nm from Westfield church spire.

   Plot the 0755 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 0845 your fix is 238°T, 2.4 nm from Tern Island tower. You steer 100°T at 6.1 kn through the water. At 0945 a new fix puts you 067°T, 2.1 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1530 your fix is 066°T, 2.8 nm from Tern Island tower. You steer 151°T at 4.3 kn through the water. At 1640 a new fix puts you 023°T, 1.5 nm from Kittle water tank.

   Plot the 1640 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn