Worksheet 102 · Skill 5

Set and drift

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1. At 1300 your fix is 086°T, 1.9 nm from Heron Point Light. You steer 024°T at 6.5 kn through the water. At 1410 a new fix puts you 319°T, 2.4 nm from Tern Island tower.

   Plot the 1410 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  

2. At 0835 your fix is 225°T, 2.5 nm from Tern Island tower. You steer 261°T at 7.4 kn through the water. At 0915 a new fix puts you 354°T, 1.9 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1015 your fix is 264°T, 1.4 nm from Tern Island tower. You steer 292°T at 7.4 kn through the water. At 1100 a new fix puts you 016°T, 3.6 nm from Westfield church spire.

   Plot the 1100 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  

4. At 0735 your fix is 155°T, 3.0 nm from Tern Island tower. You steer 008°T at 7.9 kn through the water. At 0805 a new fix puts you 048°T, 2.3 nm from Tern Island tower.

   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  

5. At 1135 your fix is 034°T, 2.4 nm from Gannet Rock daybeacon. You steer 239°T at 5.3 kn through the water. At 1205 a new fix puts you 292°T, 1.4 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1510 your fix is 050°T, 2.0 nm from Heron Point Light. You steer 336°T at 4.9 kn through the water. At 1545 a new fix puts you 064°T, 1.9 nm from Westfield church spire.

   Plot the 1545 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  

7. At 1325 your fix is 060°T, 3.1 nm from Westfield church spire. You steer 084°T at 4.4 kn through the water. At 1355 a new fix puts you 288°T, 3.0 nm from Tern Island tower.

   Plot the 1355 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 1555 your fix is 012°T, 2.3 nm from Westfield church spire. You steer 129°T at 5.6 kn through the water. At 1650 a new fix puts you 247°T, 2.6 nm from Tern Island tower.

   Plot the 1650 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