Worksheet 505 · Skill 5

Set and drift

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1. At 0840 your fix is 059°T, 3.3 nm from Heron Point Light. You steer 093°T at 5.2 kn through the water. At 0950 a new fix puts you 230°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0950 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  

2. At 0900 your fix is 120°T, 2.0 nm from Westfield church spire. You steer 135°T at 4.6 kn through the water. At 0930 a new fix puts you 061°T, 1.3 nm from Heron Point Light.

   Plot the 0930 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 0730 your fix is 078°T, 2.2 nm from Westfield church spire. You steer 165°T at 4.7 kn through the water. At 0820 a new fix puts you 082°T, 1.8 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1150 your fix is 004°T, 1.5 nm from Heron Point Light. You steer 342°T at 4.6 kn through the water. At 1235 a new fix puts you 070°T, 1.2 nm from Westfield church spire.

   Plot the 1235 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  

5. At 0710 your fix is 332°T, 2.0 nm from Tern Island tower. You steer 204°T at 4.7 kn through the water. At 0815 a new fix puts you 041°T, 2.9 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1510 your fix is 027°T, 2.4 nm from Tern Island tower. You steer 247°T at 7.7 kn through the water. At 1550 a new fix puts you 288°T, 3.9 nm from Tern Island tower.

   Plot the 1550 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 1600 your fix is 072°T, 1.4 nm from Gannet Rock daybeacon. You steer 171°T at 4.4 kn through the water. At 1635 a new fix puts you 355°T, 0.9 nm from Kittle water tank.

   Plot the 1635 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  

8. At 0945 your fix is 007°T, 2.1 nm from Westfield church spire. You steer 132°T at 7.9 kn through the water. At 1035 a new fix puts you 049°T, 3.0 nm from Heron Point Light.

   Plot the 1035 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