Worksheet 310 · Skill 5

Set and drift

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1. At 0830 your fix is 038°T, 4.5 nm from Westfield church spire. You steer 169°T at 6.6 kn through the water. At 0900 a new fix puts you 265°T, 2.8 nm from Tern Island tower.

   Plot the 0900 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 0745 your fix is 013°T, 1.6 nm from Heron Point Light. You steer 102°T at 5.0 kn through the water. At 0835 a new fix puts you 006°T, 2.1 nm from Mill stack.

   Plot the 0835 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  

3. At 1050 your fix is 296°T, 4.1 nm from Tern Island tower. You steer 181°T at 5.8 kn through the water. At 1125 a new fix puts you 047°T, 3.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1440 your fix is 298°T, 2.6 nm from Tern Island tower. You steer 189°T at 8.2 kn through the water. At 1510 a new fix puts you 229°T, 3.0 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  

5. At 1150 your fix is 152°T, 1.2 nm from Westfield church spire. You steer 118°T at 6.6 kn through the water. At 1220 a new fix puts you 059°T, 2.4 nm from Heron Point Light.

   Plot the 1220 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 1120 your fix is 063°T, 2.9 nm from Westfield church spire. You steer 148°T at 5.8 kn through the water. At 1200 a new fix puts you 032°T, 2.0 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1510 your fix is 093°T, 1.4 nm from Gannet Rock daybeacon. You steer 251°T at 6.6 kn through the water. At 1540 a new fix puts you 244°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1540 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  

8. At 1150 your fix is 024°T, 2.1 nm from Tern Island tower. You steer 252°T at 4.4 kn through the water. At 1225 a new fix puts you 327°T, 2.6 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn