Worksheet 366 · Skill 5

Set and drift

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1. At 1430 your fix is 190°T, 1.9 nm from Gannet Rock daybeacon. You steer 271°T at 7.8 kn through the water. At 1505 a new fix puts you 097°T, 1.6 nm from Heron Point Light.

   Plot the 1505 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 1100 your fix is 343°T, 3.2 nm from Kittle water tank. You steer 048°T at 7.3 kn through the water. At 1130 a new fix puts you 043°T, 4.0 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1415 your fix is 324°T, 3.0 nm from Tern Island tower. You steer 217°T at 8.3 kn through the water. At 1450 a new fix puts you 355°T, 2.0 nm from Heron Point Light.

   Plot the 1450 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  

4. At 0825 your fix is 079°T, 1.3 nm from Westfield church spire. You steer 061°T at 4.6 kn through the water. At 0920 a new fix puts you 286°T, 1.8 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0735 your fix is 064°T, 1.9 nm from Heron Point Light. You steer 011°T at 4.4 kn through the water. At 0805 a new fix puts you 040°T, 3.5 nm from Heron Point Light.

   Plot the 0805 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 1135 your fix is 187°T, 1.2 nm from Tern Island tower. You steer 282°T at 4.5 kn through the water. At 1220 a new fix puts you 255°T, 3.6 nm from Tern Island tower.

   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  

7. At 0805 your fix is 240°T, 2.7 nm from Tern Island tower. You steer 118°T at 7.9 kn through the water. At 0850 a new fix puts you 334°T, 1.5 nm from Kittle water tank.

   Plot the 0850 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 1120 your fix is 149°T, 2.6 nm from Tern Island tower. You steer 036°T at 4.2 kn through the water. At 1200 a new fix puts you 049°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 1200 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