Worksheet 918 · Skill 5

Set and drift

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1. At 1515 your fix is 012°T, 1.7 nm from Heron Point Light. You steer 110°T at 5.4 kn through the water. At 1545 a new fix puts you 065°T, 2.5 nm from Heron Point Light.

   Plot the 1545 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  

2. At 1040 your fix is 065°T, 2.6 nm from Gannet Rock daybeacon. You steer 271°T at 4.3 kn through the water. At 1200 a new fix puts you 223°T, 2.9 nm from Tern Island tower.

   Plot the 1200 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  

3. At 1025 your fix is 022°T, 2.8 nm from Westfield church spire. You steer 132°T at 4.6 kn through the water. At 1055 a new fix puts you 047°T, 2.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0845 your fix is 058°T, 4.3 nm from Tern Island tower. You steer 175°T at 8.8 kn through the water. At 0925 a new fix puts you 025°T, 2.6 nm from Kittle water tank.

   Plot the 0925 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  

5. At 1100 your fix is 131°T, 1.3 nm from Gannet Rock daybeacon. You steer 256°T at 4.1 kn through the water. At 1130 a new fix puts you 233°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1130 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  

6. At 1400 your fix is 022°T, 1.0 nm from Heron Point Light. You steer 013°T at 5.1 kn through the water. At 1430 a new fix puts you 086°T, 2.2 nm from Westfield church spire.

   Plot the 1430 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 1405 your fix is 006°T, 2.8 nm from Mill stack. You steer 094°T at 6.4 kn through the water. At 1440 a new fix puts you 005°T, 1.3 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1315 your fix is 269°T, 3.6 nm from Tern Island tower. You steer 069°T at 4.9 kn through the water. At 1345 a new fix puts you 278°T, 2.2 nm from Tern Island tower.

   Plot the 1345 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