Worksheet 91 · Skill 5

Set and drift

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1. At 0805 your fix is 054°T, 3.1 nm from Gannet Rock daybeacon. You steer 264°T at 7.0 kn through the water. At 0855 a new fix puts you 203°T, 2.1 nm from Tern Island tower.

   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  

2. At 0855 your fix is 216°T, 2.6 nm from Tern Island tower. You steer 324°T at 4.7 kn through the water. At 1005 a new fix puts you 046°T, 3.8 nm from Westfield church spire.

   Plot the 1005 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0830 your fix is 132°T, 3.1 nm from Tern Island tower. You steer 166°T at 4.2 kn through the water. At 0900 a new fix puts you 001°T, 1.2 nm from Kittle water tank.

   Plot the 0900 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 0715 your fix is 069°T, 3.4 nm from Westfield church spire. You steer 124°T at 5.5 kn through the water. At 0810 a new fix puts you 303°T, 0.9 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0840 your fix is 236°T, 1.8 nm from Tern Island tower. You steer 308°T at 5.0 kn through the water. At 0925 a new fix puts you 077°T, 3.1 nm from Westfield church spire.

   Plot the 0925 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  

6. At 1055 your fix is 128°T, 1.3 nm from Gannet Rock daybeacon. You steer 249°T at 5.1 kn through the water. At 1125 a new fix puts you 048°T, 2.2 nm from Mill stack.

   Plot the 1125 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 1040 your fix is 345°T, 2.0 nm from Tern Island tower. You steer 240°T at 5.6 kn through the water. At 1145 a new fix puts you 120°T, 1.7 nm from Westfield church spire.

   Plot the 1145 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0850 your fix is 034°T, 2.2 nm from Kittle water tank. You steer 326°T at 7.1 kn through the water. At 0940 a new fix puts you 060°T, 1.9 nm from Tern Island tower.

   Plot the 0940 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