Worksheet 743 · Skill 5

Set and drift

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1. At 1140 your fix is 058°T, 3.2 nm from Heron Point Light. You steer 059°T at 6.6 kn through the water. At 1210 a new fix puts you 205°T, 1.7 nm from Tern Island tower.

   Plot the 1210 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  

2. At 1350 your fix is 021°T, 2.4 nm from Gannet Rock daybeacon. You steer 158°T at 6.1 kn through the water. At 1430 a new fix puts you 056°T, 1.6 nm from Kittle water tank.

   Plot the 1430 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 1455 your fix is 161°T, 1.4 nm from Westfield church spire. You steer 106°T at 6.4 kn through the water. At 1530 a new fix puts you 050°T, 2.9 nm from Heron Point Light.

   Plot the 1530 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  

4. At 1020 your fix is 179°T, 1.6 nm from Tern Island tower. You steer 257°T at 5.4 kn through the water. At 1120 a new fix puts you 095°T, 1.5 nm from Westfield church spire.

   Plot the 1120 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 0700 your fix is 038°T, 1.8 nm from Tern Island tower. You steer 258°T at 6.6 kn through the water. At 0740 a new fix puts you 301°T, 3.0 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0720 your fix is 048°T, 2.0 nm from Kittle water tank. You steer 277°T at 4.5 kn through the water. At 0835 a new fix puts you 049°T, 2.2 nm from Mill stack.

   Plot the 0835 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1020 your fix is 063°T, 2.5 nm from Gannet Rock daybeacon. You steer 309°T at 4.0 kn through the water. At 1055 a new fix puts you 063°T, 2.2 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1455 your fix is 341°T, 0.8 nm from Heron Point Light. You steer 090°T at 6.7 kn through the water. At 1530 a new fix puts you 003°T, 3.1 nm from Mill stack.

   Plot the 1530 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