Worksheet 537 · Skill 5

Set and drift

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1. At 1315 your fix is 149°T, 1.4 nm from Gannet Rock daybeacon. You steer 032°T at 4.7 kn through the water. At 1355 a new fix puts you 065°T, 2.3 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1040 your fix is 077°T, 2.8 nm from Westfield church spire. You steer 196°T at 4.8 kn through the water. At 1110 a new fix puts you 021°T, 2.5 nm from Heron Point Light.

   Plot the 1110 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 0725 your fix is 032°T, 3.6 nm from Gannet Rock daybeacon. You steer 227°T at 4.0 kn through the water. At 0820 a new fix puts you 254°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0820 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  

4. At 1330 your fix is 063°T, 1.7 nm from Heron Point Light. You steer 009°T at 5.7 kn through the water. At 1405 a new fix puts you 246°T, 2.8 nm from Tern Island tower.

   Plot the 1405 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 1140 your fix is 084°T, 3.1 nm from Westfield church spire. You steer 141°T at 8.5 kn through the water. At 1210 a new fix puts you 256°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1210 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  

6. At 0810 your fix is 092°T, 2.3 nm from Gannet Rock daybeacon. You steer 324°T at 5.9 kn through the water. At 0850 a new fix puts you 050°T, 3.1 nm from Tern Island tower.

   Plot the 0850 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  

7. At 1350 your fix is 154°T, 1.6 nm from Gannet Rock daybeacon. You steer 025°T at 6.6 kn through the water. At 1440 a new fix puts you 069°T, 4.8 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1135 your fix is 356°T, 1.2 nm from Gannet Rock daybeacon. You steer 116°T at 6.1 kn through the water. At 1205 a new fix puts you 087°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1205 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