Worksheet 425 · Skill 5

Set and drift

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1. At 1000 your fix is 273°T, 0.9 nm from Gannet Rock daybeacon. You steer 245°T at 4.1 kn through the water. At 1040 a new fix puts you 001°T, 2.2 nm from Mill stack.

   Plot the 1040 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 1110 your fix is 124°T, 1.8 nm from Gannet Rock daybeacon. You steer 265°T at 8.3 kn through the water. At 1140 a new fix puts you 039°T, 2.1 nm from Mill stack.

   Plot the 1140 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  

3. At 1030 your fix is 315°T, 1.0 nm from Gannet Rock daybeacon. You steer 225°T at 5.3 kn through the water. At 1125 a new fix puts you 067°T, 1.8 nm from Heron Point Light.

   Plot the 1125 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  

4. At 0915 your fix is 057°T, 2.1 nm from Gannet Rock daybeacon. You steer 034°T at 4.5 kn through the water. At 0945 a new fix puts you 071°T, 4.8 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1340 your fix is 025°T, 2.2 nm from Heron Point Light. You steer 047°T at 5.2 kn through the water. At 1420 a new fix puts you 227°T, 1.2 nm from Tern Island tower.

   Plot the 1420 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 1255 your fix is 073°T, 2.5 nm from Westfield church spire. You steer 103°T at 7.6 kn through the water. At 1405 a new fix puts you 056°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1405 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1225 your fix is 242°T, 3.5 nm from Tern Island tower. You steer 108°T at 4.1 kn through the water. At 1305 a new fix puts you 274°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1305 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 0720 your fix is 023°T, 3.9 nm from Westfield church spire. You steer 134°T at 5.5 kn through the water. At 0750 a new fix puts you 273°T, 3.4 nm from Tern Island tower.

   Plot the 0750 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