Worksheet 903 · Skill 5

Set and drift

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1. At 1015 your fix is 047°T, 4.2 nm from Westfield church spire. You steer 095°T at 4.6 kn through the water. At 1135 a new fix puts you 286°T, 1.2 nm from Tern Island tower.

   Plot the 1135 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1145 your fix is 146°T, 1.3 nm from Tern Island tower. You steer 083°T at 4.6 kn through the water. At 1230 a new fix puts you 053°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1230 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  

3. At 0955 your fix is 095°T, 2.4 nm from Gannet Rock daybeacon. You steer 313°T at 4.2 kn through the water. At 1040 a new fix puts you 332°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1040 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  

4. At 1520 your fix is 087°T, 2.1 nm from Gannet Rock daybeacon. You steer 284°T at 7.5 kn through the water. At 1615 a new fix puts you 244°T, 2.3 nm from Tern Island tower.

   Plot the 1615 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 0730 your fix is 049°T, 2.4 nm from Heron Point Light. You steer 002°T at 7.1 kn through the water. At 0815 a new fix puts you 300°T, 4.0 nm from Tern Island tower.

   Plot the 0815 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 1355 your fix is 091°T, 2.9 nm from Westfield church spire. You steer 291°T at 5.3 kn through the water. At 1425 a new fix puts you 057°T, 1.8 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1520 your fix is 026°T, 2.8 nm from Gannet Rock daybeacon. You steer 145°T at 4.2 kn through the water. At 1605 a new fix puts you 083°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1605 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  

8. At 0700 your fix is 207°T, 2.0 nm from Tern Island tower. You steer 239°T at 7.0 kn through the water. At 0730 a new fix puts you 036°T, 2.2 nm from Heron Point Light.

   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