Worksheet 878 · Skill 5

Set and drift

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1. At 0805 your fix is 182°T, 1.7 nm from Tern Island tower. You steer 247°T at 5.1 kn through the water. At 0850 a new fix puts you 065°T, 2.5 nm from Heron Point Light.

   Plot the 0850 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  

2. At 0830 your fix is 276°T, 1.5 nm from Gannet Rock daybeacon. You steer 078°T at 4.5 kn through the water. At 0905 a new fix puts you 046°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0905 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  

3. At 1340 your fix is 332°T, 1.6 nm from Kittle water tank. You steer 308°T at 7.8 kn through the water. At 1435 a new fix puts you 032°T, 3.6 nm from Heron Point Light.

   Plot the 1435 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  

4. At 0840 your fix is 093°T, 3.5 nm from Westfield church spire. You steer 176°T at 6.1 kn through the water. At 0915 a new fix puts you 314°T, 2.0 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0740 your fix is 254°T, 2.6 nm from Tern Island tower. You steer 266°T at 5.0 kn through the water. At 0820 a new fix puts you 079°T, 2.4 nm from Westfield church spire.

   Plot the 0820 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 1530 your fix is 186°T, 1.3 nm from Tern Island tower. You steer 273°T at 4.8 kn through the water. At 1615 a new fix puts you 267°T, 3.5 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1015 your fix is 066°T, 1.2 nm from Heron Point Light. You steer 096°T at 6.6 kn through the water. At 1140 a new fix puts you 044°T, 2.2 nm from Kittle water tank.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1200 your fix is 043°T, 3.4 nm from Heron Point Light. You steer 342°T at 5.8 kn through the water. At 1235 a new fix puts you 037°T, 4.5 nm from Westfield church spire.

   Plot the 1235 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