Worksheet 274 · Skill 5

Set and drift

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1. At 1100 your fix is 290°T, 3.7 nm from Tern Island tower. You steer 167°T at 5.3 kn through the water. At 1140 a new fix puts you 251°T, 3.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0925 your fix is 234°T, 2.9 nm from Tern Island tower. You steer 225°T at 5.0 kn through the water. At 1005 a new fix puts you 085°T, 1.8 nm from Heron Point Light.

   Plot the 1005 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 1250 your fix is 061°T, 3.5 nm from Tern Island tower. You steer 194°T at 6.0 kn through the water. At 1320 a new fix puts you 137°T, 2.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1310 your fix is 261°T, 1.5 nm from Gannet Rock daybeacon. You steer 269°T at 5.4 kn through the water. At 1350 a new fix puts you 029°T, 3.0 nm from Heron Point Light.

   Plot the 1350 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  

5. At 0850 your fix is 012°T, 1.8 nm from Mill stack. You steer 344°T at 4.2 kn through the water. At 1005 a new fix puts you 302°T, 2.2 nm from Tern Island tower.

   Plot the 1005 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1410 your fix is 232°T, 2.1 nm from Tern Island tower. You steer 232°T at 4.9 kn through the water. At 1440 a new fix puts you 031°T, 2.7 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0855 your fix is 107°T, 1.2 nm from Westfield church spire. You steer 123°T at 4.2 kn through the water. At 1000 a new fix puts you 011°T, 2.4 nm from Mill stack.

   Plot the 1000 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  

8. At 1030 your fix is 313°T, 2.2 nm from Tern Island tower. You steer 247°T at 4.5 kn through the water. At 1100 a new fix puts you 286°T, 3.9 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn