Worksheet 403 · Skill 5

Set and drift

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1. At 0840 your fix is 166°T, 1.1 nm from Gannet Rock daybeacon. You steer 240°T at 5.5 kn through the water. At 0915 a new fix puts you 044°T, 2.4 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  

2. At 0750 your fix is 012°T, 2.2 nm from Gannet Rock daybeacon. You steer 216°T at 7.8 kn through the water. At 0835 a new fix puts you 006°T, 1.8 nm from Mill stack.

   Plot the 0835 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  

3. At 0750 your fix is 047°T, 1.3 nm from Westfield church spire. You steer 081°T at 7.5 kn through the water. At 0825 a new fix puts you 292°T, 2.7 nm from Tern Island tower.

   Plot the 0825 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  

4. At 0740 your fix is 023°T, 2.3 nm from Tern Island tower. You steer 244°T at 7.9 kn through the water. At 0820 a new fix puts you 270°T, 3.0 nm from Tern Island tower.

   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  

5. At 1600 your fix is 090°T, 1.9 nm from Heron Point Light. You steer 008°T at 7.4 kn through the water. At 1635 a new fix puts you 066°T, 3.3 nm from Westfield church spire.

   Plot the 1635 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 1440 your fix is 197°T, 2.2 nm from Tern Island tower. You steer 057°T at 5.0 kn through the water. At 1555 a new fix puts you 015°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1555 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  

7. At 0810 your fix is 037°T, 2.4 nm from Kittle water tank. You steer 353°T at 7.5 kn through the water. At 0850 a new fix puts you 075°T, 3.8 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1200 your fix is 254°T, 1.5 nm from Gannet Rock daybeacon. You steer 113°T at 8.0 kn through the water. At 1230 a new fix puts you 051°T, 1.0 nm from Kittle water tank.

   Plot the 1230 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