Worksheet 595 · Skill 5

Set and drift

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1. At 1040 your fix is 028°T, 4.0 nm from Westfield church spire. You steer 153°T at 7.8 kn through the water. At 1130 a new fix puts you 054°T, 3.3 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0910 your fix is 048°T, 3.3 nm from Heron Point Light. You steer 259°T at 6.5 kn through the water. At 0940 a new fix puts you 003°T, 2.0 nm from Heron Point Light.

   Plot the 0940 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 1240 your fix is 348°T, 1.7 nm from Mill stack. You steer 316°T at 7.4 kn through the water. At 1335 a new fix puts you 093°T, 1.9 nm from Westfield church spire.

   Plot the 1335 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 1510 your fix is 219°T, 2.1 nm from Tern Island tower. You steer 329°T at 5.6 kn through the water. At 1545 a new fix puts you 309°T, 2.7 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 0815 your fix is 083°T, 2.9 nm from Tern Island tower. You steer 150°T at 6.4 kn through the water. At 0855 a new fix puts you 049°T, 2.5 nm from Kittle water tank.

   Plot the 0855 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 0935 your fix is 016°T, 2.1 nm from Heron Point Light. You steer 028°T at 5.1 kn through the water. At 1040 a new fix puts you 305°T, 2.6 nm from Tern Island tower.

   Plot the 1040 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  

7. At 1035 your fix is 014°T, 1.0 nm from Gannet Rock daybeacon. You steer 265°T at 8.5 kn through the water. At 1125 a new fix puts you 025°T, 2.7 nm from Heron Point Light.

   Plot the 1125 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 1325 your fix is 165°T, 1.6 nm from Westfield church spire. You steer 095°T at 5.7 kn through the water. At 1415 a new fix puts you 343°T, 2.3 nm from Mill stack.

   Plot the 1415 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