Worksheet 338 · Skill 5

Set and drift

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1. At 1030 your fix is 077°T, 1.7 nm from Westfield church spire. You steer 097°T at 5.4 kn through the water. At 1140 a new fix puts you 191°T, 1.9 nm from Tern Island tower.

   Plot the 1140 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 1015 your fix is 085°T, 2.7 nm from Westfield church spire. You steer 029°T at 4.0 kn through the water. At 1110 a new fix puts you 288°T, 1.6 nm from Tern Island tower.

   Plot the 1110 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  

3. At 1330 your fix is 242°T, 2.2 nm from Tern Island tower. You steer 321°T at 7.4 kn through the water. At 1400 a new fix puts you 288°T, 4.0 nm from Tern Island tower.

   Plot the 1400 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 0710 your fix is 060°T, 2.4 nm from Gannet Rock daybeacon. You steer 224°T at 8.6 kn through the water. At 0740 a new fix puts you 199°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0740 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 1555 your fix is 358°T, 1.4 nm from Kittle water tank. You steer 292°T at 7.5 kn through the water. At 1640 a new fix puts you 036°T, 3.4 nm from Heron Point Light.

   Plot the 1640 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  

6. At 1205 your fix is 021°T, 1.7 nm from Mill stack. You steer 081°T at 7.6 kn through the water. At 1235 a new fix puts you 139°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1235 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 1145 your fix is 035°T, 1.1 nm from Kittle water tank. You steer 280°T at 4.4 kn through the water. At 1245 a new fix puts you 262°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1245 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  

8. At 1245 your fix is 087°T, 2.4 nm from Tern Island tower. You steer 158°T at 7.2 kn through the water. At 1315 a new fix puts you 075°T, 1.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn