Worksheet 697 · Skill 5

Set and drift

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1. At 0725 your fix is 258°T, 2.8 nm from Gannet Rock daybeacon. You steer 291°T at 5.4 kn through the water. At 0755 a new fix puts you 030°T, 3.3 nm from Heron Point Light.

   Plot the 0755 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  

2. At 1410 your fix is 061°T, 3.6 nm from Westfield church spire. You steer 177°T at 6.1 kn through the water. At 1455 a new fix puts you 089°T, 1.9 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0925 your fix is 218°T, 3.5 nm from Tern Island tower. You steer 012°T at 6.5 kn through the water. At 0955 a new fix puts you 269°T, 1.2 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0730 your fix is 158°T, 1.5 nm from Gannet Rock daybeacon. You steer 002°T at 6.0 kn through the water. At 0810 a new fix puts you 035°T, 3.8 nm from Gannet Rock daybeacon.

   Plot the 0810 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 1020 your fix is 040°T, 2.3 nm from Tern Island tower. You steer 276°T at 5.9 kn through the water. At 1115 a new fix puts you 056°T, 3.8 nm from Westfield church spire.

   Plot the 1115 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  

6. At 0705 your fix is 075°T, 2.9 nm from Westfield church spire. You steer 076°T at 4.1 kn through the water. At 0735 a new fix puts you 270°T, 3.2 nm from Tern Island tower.

   Plot the 0735 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 1130 your fix is 322°T, 1.3 nm from Gannet Rock daybeacon. You steer 087°T at 7.1 kn through the water. At 1200 a new fix puts you 051°T, 2.0 nm from Gannet Rock daybeacon.

   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  

8. At 0820 your fix is 158°T, 2.9 nm from Tern Island tower. You steer 231°T at 4.6 kn through the water. At 0850 a new fix puts you 039°T, 1.7 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn