Worksheet 77 · Skill 5

Set and drift

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1. At 0820 your fix is 240°T, 1.4 nm from Gannet Rock daybeacon. You steer 096°T at 5.4 kn through the water. At 0855 a new fix puts you 095°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0855 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 1550 your fix is 048°T, 2.6 nm from Heron Point Light. You steer 120°T at 4.3 kn through the water. At 1655 a new fix puts you 257°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1655 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1145 your fix is 081°T, 1.1 nm from Gannet Rock daybeacon. You steer 352°T at 4.3 kn through the water. At 1225 a new fix puts you 052°T, 3.0 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1045 your fix is 039°T, 1.6 nm from Kittle water tank. You steer 263°T at 8.7 kn through the water. At 1125 a new fix puts you 026°T, 1.6 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0810 your fix is 077°T, 1.7 nm from Westfield church spire. You steer 074°T at 6.4 kn through the water. At 0845 a new fix puts you 303°T, 2.6 nm from Tern Island tower.

   Plot the 0845 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  

6. At 1335 your fix is 218°T, 2.4 nm from Tern Island tower. You steer 278°T at 6.7 kn through the water. At 1410 a new fix puts you 118°T, 2.0 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1300 your fix is 057°T, 2.0 nm from Heron Point Light. You steer 325°T at 4.5 kn through the water. At 1355 a new fix puts you 114°T, 1.9 nm from Westfield church spire.

   Plot the 1355 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  

8. At 1240 your fix is 201°T, 0.9 nm from Gannet Rock daybeacon. You steer 298°T at 4.3 kn through the water. At 1350 a new fix puts you 064°T, 2.4 nm from Heron Point Light.

   Plot the 1350 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