Worksheet 412 · Skill 5

Set and drift

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1. At 0825 your fix is 042°T, 2.2 nm from Westfield church spire. You steer 160°T at 4.0 kn through the water. At 0945 a new fix puts you 073°T, 1.9 nm from Heron Point Light.

   Plot the 0945 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  

2. At 1455 your fix is 080°T, 3.0 nm from Tern Island tower. You steer 186°T at 5.1 kn through the water. At 1540 a new fix puts you 115°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1540 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  

3. At 0700 your fix is 274°T, 2.4 nm from Tern Island tower. You steer 193°T at 4.7 kn through the water. At 0735 a new fix puts you 001°T, 3.1 nm from Mill stack.

   Plot the 0735 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 0930 your fix is 007°T, 1.5 nm from Tern Island tower. You steer 258°T at 8.4 kn through the water. At 1025 a new fix puts you 029°T, 2.0 nm from Westfield church spire.

   Plot the 1025 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  

5. At 1200 your fix is 033°T, 1.3 nm from Gannet Rock daybeacon. You steer 250°T at 4.6 kn through the water. At 1240 a new fix puts you 259°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1240 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 1140 your fix is 074°T, 1.4 nm from Tern Island tower. You steer 143°T at 4.9 kn through the water. At 1245 a new fix puts you 097°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1245 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 0810 your fix is 045°T, 4.6 nm from Westfield church spire. You steer 197°T at 4.9 kn through the water. At 0850 a new fix puts you 101°T, 2.4 nm from Westfield church spire.

   Plot the 0850 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 1200 your fix is 023°T, 3.8 nm from Westfield church spire. You steer 146°T at 6.4 kn through the water. At 1315 a new fix puts you 021°T, 1.2 nm from Mill stack.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn