Worksheet 663 · Skill 5

Set and drift

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1. At 1115 your fix is 337°T, 1.4 nm from Heron Point Light. You steer 053°T at 4.3 kn through the water. At 1210 a new fix puts you 270°T, 3.7 nm from Tern Island tower.

   Plot the 1210 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  

2. At 1430 your fix is 010°T, 2.2 nm from Westfield church spire. You steer 139°T at 5.9 kn through the water. At 1510 a new fix puts you 090°T, 3.1 nm from Westfield church spire.

   Plot the 1510 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  

3. At 1325 your fix is 005°T, 2.8 nm from Mill stack. You steer 100°T at 6.9 kn through the water. At 1410 a new fix puts you 104°T, 2.0 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1215 your fix is 202°T, 1.6 nm from Tern Island tower. You steer 240°T at 7.4 kn through the water. At 1245 a new fix puts you 051°T, 2.5 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1510 your fix is 062°T, 3.3 nm from Tern Island tower. You steer 268°T at 5.3 kn through the water. At 1610 a new fix puts you 059°T, 3.5 nm from Westfield church spire.

   Plot the 1610 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  

6. At 1115 your fix is 120°T, 1.6 nm from Westfield church spire. You steer 005°T at 5.7 kn through the water. At 1150 a new fix puts you 021°T, 3.8 nm from Westfield church spire.

   Plot the 1150 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 1555 your fix is 301°T, 3.2 nm from Tern Island tower. You steer 195°T at 5.3 kn through the water. At 1630 a new fix puts you 264°T, 3.2 nm from Tern Island tower.

   Plot the 1630 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 0835 your fix is 074°T, 3.6 nm from Westfield church spire. You steer 161°T at 5.7 kn through the water. At 0930 a new fix puts you 006°T, 1.2 nm from Mill stack.

   Plot the 0930 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