Worksheet 129 · Skill 5

Set and drift

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1. At 0815 your fix is 337°T, 1.4 nm from Tern Island tower. You steer 237°T at 4.8 kn through the water. At 0920 a new fix puts you 040°T, 2.7 nm from Heron Point Light.

   Plot the 0920 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  

2. At 1105 your fix is 089°T, 2.5 nm from Tern Island tower. You steer 225°T at 6.3 kn through the water. At 1135 a new fix puts you 187°T, 1.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1355 your fix is 004°T, 3.2 nm from Mill stack. You steer 294°T at 6.8 kn through the water. At 1425 a new fix puts you 028°T, 2.1 nm from Heron Point Light.

   Plot the 1425 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 1335 your fix is 039°T, 2.3 nm from Kittle water tank. You steer 349°T at 4.9 kn through the water. At 1410 a new fix puts you 066°T, 3.3 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1400 your fix is 108°T, 1.0 nm from Gannet Rock daybeacon. You steer 025°T at 7.6 kn through the water. At 1440 a new fix puts you 063°T, 4.6 nm from Tern Island tower.

   Plot the 1440 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  

6. At 0805 your fix is 244°T, 1.7 nm from Tern Island tower. You steer 242°T at 4.0 kn through the water. At 0925 a new fix puts you 060°T, 2.0 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1340 your fix is 355°T, 2.6 nm from Mill stack. You steer 304°T at 7.2 kn through the water. At 1425 a new fix puts you 067°T, 1.6 nm from Westfield church spire.

   Plot the 1425 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  

8. At 0855 your fix is 097°T, 1.7 nm from Westfield church spire. You steer 060°T at 4.7 kn through the water. At 0950 a new fix puts you 286°T, 3.9 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn