Worksheet 216 · Skill 5

Set and drift

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1. At 0905 your fix is 079°T, 1.3 nm from Westfield church spire. You steer 096°T at 4.3 kn through the water. At 1015 a new fix puts you 226°T, 2.6 nm from Tern Island tower.

   Plot the 1015 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  

2. At 0810 your fix is 056°T, 2.9 nm from Westfield church spire. You steer 083°T at 8.3 kn through the water. At 0845 a new fix puts you 342°T, 1.9 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  

3. At 1140 your fix is 083°T, 3.2 nm from Westfield church spire. You steer 194°T at 4.2 kn through the water. At 1220 a new fix puts you 059°T, 1.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1050 your fix is 195°T, 2.1 nm from Tern Island tower. You steer 316°T at 5.0 kn through the water. At 1120 a new fix puts you 266°T, 3.2 nm from Tern Island tower.

   Plot the 1120 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 0915 your fix is 259°T, 3.4 nm from Tern Island tower. You steer 328°T at 4.4 kn through the water. At 0950 a new fix puts you 057°T, 2.6 nm from Westfield church spire.

   Plot the 0950 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 0705 your fix is 045°T, 3.6 nm from Gannet Rock daybeacon. You steer 306°T at 4.4 kn through the water. At 0750 a new fix puts you 034°T, 1.9 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1240 your fix is 115°T, 1.4 nm from Gannet Rock daybeacon. You steer 271°T at 4.4 kn through the water. At 1315 a new fix puts you 243°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1315 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 0940 your fix is 070°T, 1.4 nm from Heron Point Light. You steer 056°T at 4.0 kn through the water. At 1045 a new fix puts you 261°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1045 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