Worksheet 340 · Skill 5

Set and drift

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1. At 0705 your fix is 000°T, 3.3 nm from Mill stack. You steer 006°T at 6.3 kn through the water. At 0745 a new fix puts you 325°T, 1.8 nm from Tern Island tower.

   Plot the 0745 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 0900 your fix is 085°T, 2.2 nm from Gannet Rock daybeacon. You steer 188°T at 5.0 kn through the water. At 0930 a new fix puts you 126°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 0930 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 0735 your fix is 038°T, 2.5 nm from Westfield church spire. You steer 141°T at 5.0 kn through the water. At 0855 a new fix puts you 260°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0855 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  

4. At 0805 your fix is 044°T, 3.0 nm from Heron Point Light. You steer 327°T at 6.7 kn through the water. At 0855 a new fix puts you 039°T, 4.0 nm from Westfield church spire.

   Plot the 0855 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 0835 your fix is 336°T, 2.6 nm from Tern Island tower. You steer 249°T at 7.7 kn through the water. At 0910 a new fix puts you 027°T, 3.0 nm from Westfield church spire.

   Plot the 0910 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  

6. At 0915 your fix is 061°T, 3.2 nm from Gannet Rock daybeacon. You steer 250°T at 4.3 kn through the water. At 0955 a new fix puts you 140°T, 2.4 nm from Tern Island tower.

   Plot the 0955 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  

7. At 1425 your fix is 028°T, 2.7 nm from Kittle water tank. You steer 268°T at 7.7 kn through the water. At 1540 a new fix puts you 089°T, 1.7 nm from Heron Point Light.

   Plot the 1540 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  

8. At 1340 your fix is 142°T, 1.7 nm from Westfield church spire. You steer 042°T at 4.2 kn through the water. At 1455 a new fix puts you 058°T, 4.0 nm from Westfield church spire.

   Plot the 1455 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