Worksheet 571 · Skill 5

Set and drift

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1. At 0900 your fix is 024°T, 2.0 nm from Kittle water tank. You steer 344°T at 6.9 kn through the water. At 0935 a new fix puts you 042°T, 2.4 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1005 your fix is 264°T, 3.0 nm from Tern Island tower. You steer 156°T at 5.9 kn through the water. At 1055 a new fix puts you 022°T, 1.9 nm from Mill stack.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1140 your fix is 259°T, 2.4 nm from Gannet Rock daybeacon. You steer 329°T at 6.4 kn through the water. At 1230 a new fix puts you 317°T, 3.5 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1515 your fix is 044°T, 2.4 nm from Mill stack. You steer 026°T at 6.7 kn through the water. At 1615 a new fix puts you 050°T, 3.6 nm from Tern Island tower.

   Plot the 1615 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  

5. At 1155 your fix is 002°T, 2.8 nm from Mill stack. You steer 276°T at 4.1 kn through the water. At 1225 a new fix puts you 024°T, 1.5 nm from Heron Point Light.

   Plot the 1225 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  

6. At 0835 your fix is 096°T, 2.2 nm from Westfield church spire. You steer 123°T at 8.5 kn through the water. At 0910 a new fix puts you 028°T, 2.5 nm from Mill stack.

   Plot the 0910 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 1410 your fix is 088°T, 1.3 nm from Gannet Rock daybeacon. You steer 248°T at 8.0 kn through the water. At 1445 a new fix puts you 038°T, 2.3 nm from Mill stack.

   Plot the 1445 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  

8. At 1235 your fix is 318°T, 2.9 nm from Tern Island tower. You steer 202°T at 5.9 kn through the water. At 1315 a new fix puts you 016°T, 2.2 nm from Heron Point Light.

   Plot the 1315 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