Worksheet 938 · Skill 5

Set and drift

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1. At 1205 your fix is 330°T, 1.6 nm from Heron Point Light. You steer 097°T at 8.2 kn through the water. At 1305 a new fix puts you 217°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1305 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  

2. At 0750 your fix is 056°T, 1.8 nm from Westfield church spire. You steer 101°T at 6.1 kn through the water. At 0830 a new fix puts you 223°T, 1.5 nm from Tern Island tower.

   Plot the 0830 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  

3. At 0835 your fix is 082°T, 1.5 nm from Tern Island tower. You steer 107°T at 4.2 kn through the water. At 0915 a new fix puts you 035°T, 3.5 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1440 your fix is 310°T, 2.9 nm from Tern Island tower. You steer 217°T at 4.0 kn through the water. At 1545 a new fix puts you 352°T, 1.9 nm from Heron Point Light.

   Plot the 1545 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  

5. At 1055 your fix is 059°T, 3.0 nm from Westfield church spire. You steer 198°T at 7.2 kn through the water. At 1130 a new fix puts you 343°T, 1.6 nm from Heron Point Light.

   Plot the 1130 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  

6. At 1425 your fix is 011°T, 1.6 nm from Kittle water tank. You steer 259°T at 5.7 kn through the water. At 1500 a new fix puts you 206°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1500 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  

7. At 1300 your fix is 266°T, 3.2 nm from Tern Island tower. You steer 224°T at 5.3 kn through the water. At 1330 a new fix puts you 345°T, 1.5 nm from Heron Point Light.

   Plot the 1330 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  

8. At 1405 your fix is 068°T, 2.5 nm from Heron Point Light. You steer 284°T at 5.8 kn through the water. At 1440 a new fix puts you 115°T, 1.5 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn