Worksheet 440 · Skill 5

Set and drift

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1. At 1300 your fix is 008°T, 2.3 nm from Mill stack. You steer 095°T at 4.7 kn through the water. At 1335 a new fix puts you 231°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1335 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 1310 your fix is 287°T, 2.7 nm from Tern Island tower. You steer 150°T at 5.5 kn through the water. At 1425 a new fix puts you 040°T, 2.5 nm from Mill stack.

   Plot the 1425 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  

3. At 0700 your fix is 050°T, 1.3 nm from Kittle water tank. You steer 347°T at 7.3 kn through the water. At 0730 a new fix puts you 039°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 0730 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 0810 your fix is 009°T, 2.5 nm from Mill stack. You steer 052°T at 6.3 kn through the water. At 0850 a new fix puts you 031°T, 2.5 nm from Gannet Rock daybeacon.

   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  

5. At 0705 your fix is 075°T, 1.3 nm from Westfield church spire. You steer 119°T at 4.4 kn through the water. At 0745 a new fix puts you 058°T, 2.3 nm from Heron Point Light.

   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  

6. At 1200 your fix is 315°T, 1.5 nm from Gannet Rock daybeacon. You steer 047°T at 7.3 kn through the water. At 1235 a new fix puts you 074°T, 3.8 nm from Tern Island tower.

   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  

7. At 1345 your fix is 039°T, 2.5 nm from Mill stack. You steer 317°T at 6.2 kn through the water. At 1420 a new fix puts you 234°T, 3.4 nm from Tern Island tower.

   Plot the 1420 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  

8. At 1120 your fix is 245°T, 3.4 nm from Tern Island tower. You steer 300°T at 5.0 kn through the water. At 1200 a new fix puts you 357°T, 1.4 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn