Worksheet 688 · Skill 5

Set and drift

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1. At 0950 your fix is 040°T, 4.2 nm from Gannet Rock daybeacon. You steer 233°T at 5.8 kn through the water. At 1120 a new fix puts you 314°T, 1.6 nm from Mill stack.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1015 your fix is 046°T, 4.2 nm from Westfield church spire. You steer 159°T at 6.1 kn through the water. At 1115 a new fix puts you 199°T, 2.5 nm from Tern Island tower.

   Plot the 1115 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1420 your fix is 064°T, 2.9 nm from Westfield church spire. You steer 077°T at 7.1 kn through the water. At 1500 a new fix puts you 322°T, 1.2 nm from Tern Island tower.

   Plot the 1500 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 1300 your fix is 058°T, 1.5 nm from Heron Point Light. You steer 330°T at 5.7 kn through the water. At 1340 a new fix puts you 049°T, 2.1 nm from Westfield church spire.

   Plot the 1340 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 0950 your fix is 251°T, 3.6 nm from Tern Island tower. You steer 241°T at 6.1 kn through the water. At 1020 a new fix puts you 006°T, 1.9 nm from Heron Point Light.

   Plot the 1020 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 0935 your fix is 019°T, 1.7 nm from Gannet Rock daybeacon. You steer 176°T at 4.5 kn through the water. At 1010 a new fix puts you 141°T, 0.8 nm from Gannet Rock daybeacon.

   Plot the 1010 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 1125 your fix is 117°T, 1.7 nm from Tern Island tower. You steer 136°T at 4.1 kn through the water. At 1205 a new fix puts you 087°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1205 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 1045 your fix is 038°T, 1.5 nm from Gannet Rock daybeacon. You steer 255°T at 4.2 kn through the water. At 1130 a new fix puts you 258°T, 1.9 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn