Worksheet 97 · Skill 5

Set and drift

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1. At 1305 your fix is 327°T, 1.6 nm from Heron Point Light. You steer 052°T at 4.9 kn through the water. At 1345 a new fix puts you 258°T, 3.7 nm from Tern Island tower.

   Plot the 1345 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 1440 your fix is 001°T, 1.5 nm from Kittle water tank. You steer 263°T at 4.9 kn through the water. At 1550 a new fix puts you 311°T, 1.5 nm from Mill stack.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1135 your fix is 033°T, 2.2 nm from Heron Point Light. You steer 345°T at 4.7 kn through the water. At 1230 a new fix puts you 285°T, 3.9 nm from Tern Island tower.

   Plot the 1230 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 1010 your fix is 035°T, 2.0 nm from Heron Point Light. You steer 353°T at 6.0 kn through the water. At 1055 a new fix puts you 049°T, 3.5 nm from Westfield church spire.

   Plot the 1055 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 0815 your fix is 145°T, 2.4 nm from Tern Island tower. You steer 012°T at 5.2 kn through the water. At 0900 a new fix puts you 057°T, 2.2 nm from Tern Island tower.

   Plot the 0900 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 0845 your fix is 068°T, 3.2 nm from Westfield church spire. You steer 170°T at 4.7 kn through the water. At 0935 a new fix puts you 045°T, 1.5 nm from Heron Point Light.

   Plot the 0935 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  

7. At 0710 your fix is 134°T, 3.3 nm from Tern Island tower. You steer 021°T at 7.8 kn through the water. At 0740 a new fix puts you 042°T, 4.0 nm from Gannet Rock daybeacon.

   Plot the 0740 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 0905 your fix is 225°T, 2.0 nm from Tern Island tower. You steer 255°T at 6.1 kn through the water. At 0950 a new fix puts you 029°T, 1.8 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn