Worksheet 184 · Skill 5

Set and drift

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1. At 0750 your fix is 318°T, 2.2 nm from Tern Island tower. You steer 084°T at 8.5 kn through the water. At 0830 a new fix puts you 041°T, 4.8 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1550 your fix is 040°T, 2.3 nm from Heron Point Light. You steer 331°T at 6.0 kn through the water. At 1630 a new fix puts you 025°T, 3.7 nm from Westfield church spire.

   Plot the 1630 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 1130 your fix is 203°T, 2.8 nm from Tern Island tower. You steer 344°T at 4.8 kn through the water. At 1200 a new fix puts you 247°T, 1.5 nm from Tern Island tower.

   Plot the 1200 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 1510 your fix is 074°T, 2.7 nm from Westfield church spire. You steer 147°T at 4.6 kn through the water. At 1600 a new fix puts you 073°T, 2.3 nm from Heron Point Light.

   Plot the 1600 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  

5. At 0920 your fix is 129°T, 3.1 nm from Tern Island tower. You steer 278°T at 5.7 kn through the water. At 0950 a new fix puts you 181°T, 1.2 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0825 your fix is 022°T, 2.2 nm from Heron Point Light. You steer 039°T at 4.8 kn through the water. At 0925 a new fix puts you 325°T, 1.2 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1105 your fix is 036°T, 3.3 nm from Westfield church spire. You steer 160°T at 6.1 kn through the water. At 1205 a new fix puts you 096°T, 1.7 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0800 your fix is 099°T, 1.6 nm from Gannet Rock daybeacon. You steer 336°T at 5.5 kn through the water. At 0900 a new fix puts you 046°T, 2.7 nm from Tern Island tower.

   Plot the 0900 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