Worksheet 416 · Skill 5

Set and drift

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1. At 1520 your fix is 055°T, 2.7 nm from Heron Point Light. You steer 106°T at 6.1 kn through the water. At 1555 a new fix puts you 256°T, 1.3 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1020 your fix is 086°T, 1.1 nm from Westfield church spire. You steer 025°T at 6.6 kn through the water. At 1055 a new fix puts you 040°T, 4.0 nm from Westfield church spire.

   Plot the 1055 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 1015 your fix is 045°T, 2.8 nm from Westfield church spire. You steer 161°T at 8.5 kn through the water. At 1050 a new fix puts you 063°T, 1.3 nm from Heron Point Light.

   Plot the 1050 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 0835 your fix is 308°T, 2.8 nm from Tern Island tower. You steer 247°T at 5.3 kn through the water. At 0920 a new fix puts you 018°T, 3.1 nm from Westfield church spire.

   Plot the 0920 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 0920 your fix is 060°T, 1.3 nm from Gannet Rock daybeacon. You steer 349°T at 4.2 kn through the water. At 1015 a new fix puts you 042°T, 1.7 nm from Tern Island tower.

   Plot the 1015 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  

6. At 1140 your fix is 061°T, 3.1 nm from Gannet Rock daybeacon. You steer 263°T at 7.0 kn through the water. At 1225 a new fix puts you 209°T, 3.1 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0900 your fix is 077°T, 3.7 nm from Westfield church spire. You steer 062°T at 6.2 kn through the water. At 0940 a new fix puts you 012°T, 1.6 nm from Tern Island tower.

   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  

8. At 1330 your fix is 256°T, 3.2 nm from Tern Island tower. You steer 185°T at 5.5 kn through the water. At 1415 a new fix puts you 331°T, 1.8 nm from Mill stack.

   Plot the 1415 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