Worksheet 535 · Skill 5

Set and drift

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1. At 1355 your fix is 352°T, 3.1 nm from Mill stack. You steer 075°T at 5.8 kn through the water. At 1435 a new fix puts you 288°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1435 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 0755 your fix is 003°T, 1.6 nm from Heron Point Light. You steer 091°T at 4.7 kn through the water. At 0850 a new fix puts you 014°T, 2.9 nm from Mill stack.

   Plot the 0850 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 1520 your fix is 310°T, 1.8 nm from Tern Island tower. You steer 224°T at 4.7 kn through the water. At 1630 a new fix puts you 028°T, 2.3 nm from Heron Point Light.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1510 your fix is 339°T, 2.7 nm from Mill stack. You steer 001°T at 5.8 kn through the water. At 1545 a new fix puts you 251°T, 2.1 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1310 your fix is 012°T, 1.4 nm from Westfield church spire. You steer 118°T at 4.8 kn through the water. At 1440 a new fix puts you 283°T, 2.6 nm from Kittle water tank.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1305 your fix is 136°T, 1.3 nm from Gannet Rock daybeacon. You steer 269°T at 6.5 kn through the water. At 1425 a new fix puts you 037°T, 1.6 nm from Heron Point Light.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0730 your fix is 008°T, 2.4 nm from Mill stack. You steer 035°T at 5.3 kn through the water. At 0800 a new fix puts you 210°T, 1.7 nm from Tern Island tower.

   Plot the 0800 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 0845 your fix is 077°T, 2.7 nm from Westfield church spire. You steer 161°T at 4.1 kn through the water. At 0925 a new fix puts you 347°T, 2.8 nm from Mill stack.

   Plot the 0925 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