Worksheet 183 · Skill 5

Set and drift

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1. At 0730 your fix is 024°T, 2.1 nm from Heron Point Light. You steer 073°T at 4.1 kn through the water. At 0810 a new fix puts you 239°T, 3.4 nm from Tern Island tower.

   Plot the 0810 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  

2. At 1040 your fix is 178°T, 1.4 nm from Westfield church spire. You steer 062°T at 7.5 kn through the water. At 1115 a new fix puts you 251°T, 3.5 nm from Tern Island tower.

   Plot the 1115 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 1410 your fix is 163°T, 1.1 nm from Gannet Rock daybeacon. You steer 022°T at 6.4 kn through the water. At 1455 a new fix puts you 048°T, 4.1 nm from Gannet Rock daybeacon.

   Plot the 1455 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  

4. At 1150 your fix is 326°T, 2.2 nm from Mill stack. You steer 097°T at 5.6 kn through the water. At 1240 a new fix puts you 326°T, 2.7 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0855 your fix is 305°T, 0.9 nm from Gannet Rock daybeacon. You steer 278°T at 5.6 kn through the water. At 0955 a new fix puts you 039°T, 0.9 nm from Westfield church spire.

   Plot the 0955 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1440 your fix is 236°T, 1.5 nm from Gannet Rock daybeacon. You steer 314°T at 8.1 kn through the water. At 1510 a new fix puts you 226°T, 2.0 nm from Tern Island tower.

   Plot the 1510 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  

7. At 1020 your fix is 266°T, 1.6 nm from Gannet Rock daybeacon. You steer 068°T at 6.8 kn through the water. At 1055 a new fix puts you 047°T, 2.1 nm from Gannet Rock daybeacon.

   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  

8. At 1340 your fix is 048°T, 1.1 nm from Westfield church spire. You steer 063°T at 8.5 kn through the water. At 1410 a new fix puts you 308°T, 3.2 nm from Tern Island tower.

   Plot the 1410 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