Worksheet 748 · Skill 5

Set and drift

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1. At 0955 your fix is 249°T, 3.5 nm from Tern Island tower. You steer 038°T at 6.7 kn through the water. At 1035 a new fix puts you 321°T, 2.4 nm from Tern Island tower.

   Plot the 1035 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  

2. At 1425 your fix is 097°T, 2.7 nm from Gannet Rock daybeacon. You steer 302°T at 5.0 kn through the water. At 1500 a new fix puts you 343°T, 3.2 nm from Kittle water tank.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1350 your fix is 070°T, 3.3 nm from Westfield church spire. You steer 162°T at 7.9 kn through the water. At 1430 a new fix puts you 319°T, 1.9 nm from Mill stack.

   Plot the 1430 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 1255 your fix is 022°T, 2.0 nm from Westfield church spire. You steer 135°T at 4.5 kn through the water. At 1350 a new fix puts you 214°T, 2.6 nm from Tern Island tower.

   Plot the 1350 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 1530 your fix is 015°T, 3.0 nm from Westfield church spire. You steer 148°T at 5.1 kn through the water. At 1615 a new fix puts you 103°T, 2.3 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1215 your fix is 075°T, 1.0 nm from Heron Point Light. You steer 002°T at 4.7 kn through the water. At 1245 a new fix puts you 035°T, 3.2 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  

7. At 1535 your fix is 224°T, 2.2 nm from Tern Island tower. You steer 080°T at 5.9 kn through the water. At 1610 a new fix puts you 353°T, 1.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1450 your fix is 276°T, 3.2 nm from Tern Island tower. You steer 223°T at 5.2 kn through the water. At 1535 a new fix puts you 358°T, 2.0 nm from Heron Point Light.

   Plot the 1535 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