Worksheet 258 · Skill 5

Set and drift

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1. At 0815 your fix is 027°T, 3.5 nm from Westfield church spire. You steer 097°T at 4.2 kn through the water. At 0855 a new fix puts you 305°T, 2.6 nm from Tern Island tower.

   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  

2. At 1255 your fix is 053°T, 1.8 nm from Gannet Rock daybeacon. You steer 179°T at 5.0 kn through the water. At 1335 a new fix puts you 005°T, 1.9 nm from Kittle water tank.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1525 your fix is 231°T, 2.9 nm from Tern Island tower. You steer 250°T at 4.2 kn through the water. At 1620 a new fix puts you 327°T, 1.8 nm from Heron Point Light.

   Plot the 1620 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 007°T, 1.8 nm from Heron Point Light. You steer 113°T at 4.1 kn through the water. At 1555 a new fix puts you 338°T, 2.2 nm from Mill stack.

   Plot the 1555 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 1100 your fix is 246°T, 2.9 nm from Tern Island tower. You steer 003°T at 4.4 kn through the water. At 1135 a new fix puts you 310°T, 3.7 nm from Tern Island tower.

   Plot the 1135 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  

6. At 0855 your fix is 029°T, 1.8 nm from Mill stack. You steer 331°T at 6.9 kn through the water. At 0925 a new fix puts you 251°T, 2.8 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1430 your fix is 036°T, 3.1 nm from Gannet Rock daybeacon. You steer 236°T at 8.6 kn through the water. At 1510 a new fix puts you 064°T, 3.1 nm from Heron Point Light.

   Plot the 1510 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  

8. At 1450 your fix is 277°T, 1.5 nm from Gannet Rock daybeacon. You steer 281°T at 4.6 kn through the water. At 1620 a new fix puts you 021°T, 1.7 nm from Heron Point Light.

   Plot the 1620 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