Worksheet 908 · Skill 5

Set and drift

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1. At 1135 your fix is 305°T, 4.0 nm from Tern Island tower. You steer 185°T at 7.9 kn through the water. At 1220 a new fix puts you 060°T, 1.3 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1545 your fix is 058°T, 1.8 nm from Heron Point Light. You steer 036°T at 5.8 kn through the water. At 1615 a new fix puts you 218°T, 2.5 nm from Tern Island tower.

   Plot the 1615 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  

3. At 1110 your fix is 067°T, 2.7 nm from Gannet Rock daybeacon. You steer 209°T at 4.1 kn through the water. At 1140 a new fix puts you 153°T, 1.2 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0850 your fix is 042°T, 1.5 nm from Heron Point Light. You steer 355°T at 6.1 kn through the water. At 0920 a new fix puts you 080°T, 3.1 nm from Westfield church spire.

   Plot the 0920 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 1335 your fix is 336°T, 1.7 nm from Mill stack. You steer 026°T at 5.9 kn through the water. At 1410 a new fix puts you 203°T, 2.8 nm from Tern Island tower.

   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  

6. At 0800 your fix is 281°T, 2.2 nm from Tern Island tower. You steer 140°T at 4.8 kn through the water. At 0835 a new fix puts you 255°T, 2.4 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1215 your fix is 049°T, 4.1 nm from Westfield church spire. You steer 218°T at 4.0 kn through the water. At 1300 a new fix puts you 120°T, 2.1 nm from Westfield church spire.

   Plot the 1300 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  

8. At 0715 your fix is 295°T, 4.0 nm from Tern Island tower. You steer 185°T at 5.7 kn through the water. At 0755 a new fix puts you 019°T, 2.7 nm from Heron Point Light.

   Plot the 0755 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