Worksheet 769 · Skill 5

Set and drift

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1. At 1005 your fix is 026°T, 2.5 nm from Gannet Rock daybeacon. You steer 308°T at 4.4 kn through the water. At 1045 a new fix puts you 009°T, 1.5 nm from Tern Island tower.

   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  

2. At 1330 your fix is 040°T, 1.8 nm from Heron Point Light. You steer 342°T at 4.0 kn through the water. At 1440 a new fix puts you 291°T, 3.7 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1350 your fix is 245°T, 1.2 nm from Gannet Rock daybeacon. You steer 100°T at 5.8 kn through the water. At 1430 a new fix puts you 042°T, 1.1 nm from Kittle water tank.

   Plot the 1430 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  

4. At 1325 your fix is 045°T, 2.3 nm from Westfield church spire. You steer 113°T at 5.1 kn through the water. At 1425 a new fix puts you 176°T, 1.5 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1030 your fix is 043°T, 1.4 nm from Gannet Rock daybeacon. You steer 002°T at 4.4 kn through the water. At 1115 a new fix puts you 035°T, 3.8 nm from Gannet Rock daybeacon.

   Plot the 1115 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 1510 your fix is 048°T, 3.4 nm from Tern Island tower. You steer 250°T at 6.4 kn through the water. At 1610 a new fix puts you 286°T, 3.6 nm from Tern Island tower.

   Plot the 1610 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  

7. At 1140 your fix is 154°T, 2.5 nm from Tern Island tower. You steer 261°T at 4.0 kn through the water. At 1225 a new fix puts you 206°T, 1.6 nm from Tern Island tower.

   Plot the 1225 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 1535 your fix is 069°T, 3.6 nm from Tern Island tower. You steer 193°T at 6.3 kn through the water. At 1620 a new fix puts you 346°T, 1.7 nm from Kittle water tank.

   Plot the 1620 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