Worksheet 108 · Skill 5

Set and drift

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1. At 1515 your fix is 046°T, 1.9 nm from Heron Point Light. You steer 067°T at 5.7 kn through the water. At 1545 a new fix puts you 002°T, 3.2 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1055 your fix is 081°T, 2.6 nm from Tern Island tower. You steer 206°T at 8.6 kn through the water. At 1130 a new fix puts you 254°T, 1.0 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1555 your fix is 310°T, 2.0 nm from Tern Island tower. You steer 182°T at 4.3 kn through the water. At 1705 a new fix puts you 047°T, 3.4 nm from Heron Point Light.

   Plot the 1705 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 1050 your fix is 143°T, 1.2 nm from Gannet Rock daybeacon. You steer 043°T at 4.0 kn through the water. At 1140 a new fix puts you 090°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1140 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  

5. At 1355 your fix is 091°T, 2.0 nm from Westfield church spire. You steer 113°T at 5.6 kn through the water. At 1525 a new fix puts you 137°T, 2.7 nm from Tern Island tower.

   Plot the 1525 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 1500 your fix is 066°T, 2.8 nm from Tern Island tower. You steer 176°T at 4.9 kn through the water. At 1605 a new fix puts you 036°T, 3.1 nm from Kittle water tank.

   Plot the 1605 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 1135 your fix is 078°T, 2.5 nm from Tern Island tower. You steer 296°T at 4.6 kn through the water. At 1225 a new fix puts you 345°T, 2.2 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0925 your fix is 352°T, 1.6 nm from Mill stack. You steer 302°T at 4.7 kn through the water. At 1000 a new fix puts you 040°T, 1.0 nm from Heron Point Light.

   Plot the 1000 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