Worksheet 94 · Skill 5

Set and drift

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1. At 1255 your fix is 002°T, 2.2 nm from Westfield church spire. You steer 082°T at 8.2 kn through the water. At 1330 a new fix puts you 293°T, 2.7 nm from Tern Island tower.

   Plot the 1330 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 0805 your fix is 113°T, 2.1 nm from Westfield church spire. You steer 130°T at 5.5 kn through the water. At 0900 a new fix puts you 069°T, 2.9 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1345 your fix is 316°T, 1.9 nm from Tern Island tower. You steer 278°T at 6.8 kn through the water. At 1415 a new fix puts you 051°T, 4.2 nm from Westfield church spire.

   Plot the 1415 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 1250 your fix is 254°T, 2.7 nm from Gannet Rock daybeacon. You steer 313°T at 4.0 kn through the water. At 1350 a new fix puts you 032°T, 3.7 nm from Heron Point Light.

   Plot the 1350 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1230 your fix is 058°T, 2.9 nm from Tern Island tower. You steer 141°T at 4.0 kn through the water. At 1315 a new fix puts you 063°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1315 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 1220 your fix is 229°T, 3.2 nm from Tern Island tower. You steer 302°T at 5.0 kn through the water. At 1325 a new fix puts you 125°T, 1.0 nm from Westfield church spire.

   Plot the 1325 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  

7. At 1005 your fix is 168°T, 1.6 nm from Gannet Rock daybeacon. You steer 032°T at 5.9 kn through the water. At 1045 a new fix puts you 060°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1045 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 0910 your fix is 034°T, 4.0 nm from Westfield church spire. You steer 093°T at 8.3 kn through the water. At 1000 a new fix puts you 082°T, 3.1 nm from Tern Island tower.

   Plot the 1000 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