Worksheet 497 · Skill 5

Set and drift

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1. At 1155 your fix is 176°T, 1.3 nm from Westfield church spire. You steer 065°T at 6.7 kn through the water. At 1240 a new fix puts you 077°T, 3.3 nm from Westfield church spire.

   Plot the 1240 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  

2. At 0810 your fix is 021°T, 2.7 nm from Heron Point Light. You steer 331°T at 4.7 kn through the water. At 0840 a new fix puts you 029°T, 2.4 nm from Westfield church spire.

   Plot the 0840 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  

3. At 0735 your fix is 088°T, 2.0 nm from Westfield church spire. You steer 053°T at 5.1 kn through the water. At 0810 a new fix puts you 057°T, 3.5 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1345 your fix is 330°T, 1.2 nm from Heron Point Light. You steer 035°T at 5.4 kn through the water. At 1440 a new fix puts you 269°T, 3.0 nm from Tern Island tower.

   Plot the 1440 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 1225 your fix is 186°T, 1.8 nm from Gannet Rock daybeacon. You steer 318°T at 6.8 kn through the water. At 1300 a new fix puts you 209°T, 2.8 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0950 your fix is 168°T, 1.4 nm from Westfield church spire. You steer 102°T at 6.7 kn through the water. At 1100 a new fix puts you 265°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1100 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  

7. At 0730 your fix is 215°T, 2.3 nm from Gannet Rock daybeacon. You steer 305°T at 8.0 kn through the water. At 0800 a new fix puts you 052°T, 3.4 nm from Heron Point Light.

   Plot the 0800 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 006°T, 1.0 nm from Gannet Rock daybeacon. You steer 253°T at 5.1 kn through the water. At 1145 a new fix puts you 234°T, 2.5 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn