Worksheet 177 · Skill 5

Set and drift

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1. At 1305 your fix is 066°T, 1.9 nm from Heron Point Light. You steer 095°T at 5.9 kn through the water. At 1355 a new fix puts you 182°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1355 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  

2. At 1030 your fix is 011°T, 1.8 nm from Westfield church spire. You steer 101°T at 6.6 kn through the water. At 1110 a new fix puts you 242°T, 2.1 nm from Tern Island tower.

   Plot the 1110 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 0805 your fix is 300°T, 4.6 nm from Tern Island tower. You steer 221°T at 5.3 kn through the water. At 0840 a new fix puts you 042°T, 1.3 nm from Westfield church spire.

   Plot the 0840 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 1450 your fix is 029°T, 3.4 nm from Heron Point Light. You steer 290°T at 4.8 kn through the water. At 1520 a new fix puts you 084°T, 1.6 nm from Westfield church spire.

   Plot the 1520 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  

5. At 0855 your fix is 305°T, 2.4 nm from Tern Island tower. You steer 196°T at 4.8 kn through the water. At 0945 a new fix puts you 030°T, 2.5 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1435 your fix is 333°T, 1.3 nm from Gannet Rock daybeacon. You steer 277°T at 4.4 kn through the water. At 1600 a new fix puts you 063°T, 1.7 nm from Westfield church spire.

   Plot the 1600 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1310 your fix is 003°T, 2.7 nm from Westfield church spire. You steer 112°T at 7.3 kn through the water. At 1440 a new fix puts you 329°T, 2.6 nm from Kittle water tank.

   Plot the 1440 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  

8. At 1530 your fix is 015°T, 3.7 nm from Westfield church spire. You steer 140°T at 9.0 kn through the water. At 1635 a new fix puts you 011°T, 3.0 nm from Mill stack.

   Plot the 1635 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