Worksheet 70 · Skill 5

Set and drift

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1. At 1550 your fix is 160°T, 1.1 nm from Gannet Rock daybeacon. You steer 295°T at 7.1 kn through the water. At 1645 a new fix puts you 048°T, 3.5 nm from Heron Point Light.

   Plot the 1645 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  

2. At 1130 your fix is 247°T, 1.7 nm from Gannet Rock daybeacon. You steer 275°T at 5.4 kn through the water. At 1220 a new fix puts you 005°T, 1.8 nm from Heron Point Light.

   Plot the 1220 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 0900 your fix is 079°T, 0.8 nm from Gannet Rock daybeacon. You steer 006°T at 4.4 kn through the water. At 0940 a new fix puts you 038°T, 3.8 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0735 your fix is 014°T, 2.7 nm from Westfield church spire. You steer 143°T at 5.9 kn through the water. At 0855 a new fix puts you 242°T, 3.6 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0755 your fix is 040°T, 3.0 nm from Tern Island tower. You steer 262°T at 7.9 kn through the water. At 0830 a new fix puts you 324°T, 2.5 nm from Tern Island tower.

   Plot the 0830 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 1135 your fix is 300°T, 3.1 nm from Tern Island tower. You steer 189°T at 7.2 kn through the water. At 1215 a new fix puts you 038°T, 2.5 nm from Heron Point Light.

   Plot the 1215 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  

7. At 1300 your fix is 073°T, 1.8 nm from Heron Point Light. You steer 078°T at 8.4 kn through the water. At 1335 a new fix puts you 238°T, 1.5 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0820 your fix is 115°T, 1.9 nm from Gannet Rock daybeacon. You steer 343°T at 4.7 kn through the water. At 0910 a new fix puts you 014°T, 1.8 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn