Worksheet 509 · Skill 5

Set and drift

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1. At 0855 your fix is 054°T, 2.4 nm from Gannet Rock daybeacon. You steer 183°T at 5.5 kn through the water. At 0925 a new fix puts you 034°T, 2.1 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1200 your fix is 042°T, 1.8 nm from Westfield church spire. You steer 101°T at 4.4 kn through the water. At 1300 a new fix puts you 191°T, 1.7 nm from Tern Island tower.

   Plot the 1300 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  

3. At 1220 your fix is 279°T, 1.3 nm from Gannet Rock daybeacon. You steer 279°T at 4.2 kn through the water. At 1250 a new fix puts you 195°T, 1.9 nm from Tern Island tower.

   Plot the 1250 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 0935 your fix is 261°T, 2.9 nm from Tern Island tower. You steer 121°T at 6.8 kn through the water. At 1010 a new fix puts you 225°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1010 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  

5. At 1320 your fix is 033°T, 1.9 nm from Tern Island tower. You steer 271°T at 6.0 kn through the water. At 1355 a new fix puts you 298°T, 2.8 nm from Tern Island tower.

   Plot the 1355 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 0945 your fix is 307°T, 2.8 nm from Tern Island tower. You steer 165°T at 8.6 kn through the water. At 1020 a new fix puts you 229°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1020 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 1320 your fix is 048°T, 2.3 nm from Westfield church spire. You steer 140°T at 5.9 kn through the water. At 1350 a new fix puts you 256°T, 3.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1050 your fix is 287°T, 3.2 nm from Tern Island tower. You steer 164°T at 5.9 kn through the water. At 1140 a new fix puts you 354°T, 3.2 nm from Mill stack.

   Plot the 1140 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