Worksheet 553 · Skill 5

Set and drift

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1. At 0900 your fix is 035°T, 1.9 nm from Gannet Rock daybeacon. You steer 176°T at 6.8 kn through the water. At 0930 a new fix puts you 020°T, 1.6 nm from Kittle water tank.

   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  

2. At 1050 your fix is 029°T, 2.6 nm from Mill stack. You steer 300°T at 5.9 kn through the water. At 1145 a new fix puts you 131°T, 1.6 nm from Westfield church spire.

   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  

3. At 0955 your fix is 071°T, 3.2 nm from Westfield church spire. You steer 150°T at 4.9 kn through the water. At 1035 a new fix puts you 058°T, 2.8 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1425 your fix is 106°T, 2.4 nm from Gannet Rock daybeacon. You steer 254°T at 5.7 kn through the water. At 1535 a new fix puts you 038°T, 1.8 nm from Mill stack.

   Plot the 1535 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  

5. At 1550 your fix is 347°T, 3.1 nm from Mill stack. You steer 314°T at 7.9 kn through the water. At 1630 a new fix puts you 358°T, 1.6 nm from Westfield church spire.

   Plot the 1630 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  

6. At 1050 your fix is 041°T, 2.0 nm from Westfield church spire. You steer 123°T at 4.7 kn through the water. At 1135 a new fix puts you 215°T, 2.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0825 your fix is 128°T, 1.6 nm from Gannet Rock daybeacon. You steer 280°T at 7.3 kn through the water. At 0915 a new fix puts you 062°T, 2.2 nm from Heron Point Light.

   Plot the 0915 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 1320 your fix is 320°T, 2.6 nm from Tern Island tower. You steer 265°T at 6.8 kn through the water. At 1405 a new fix puts you 045°T, 2.1 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn