Worksheet 921 · Skill 5

Set and drift

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1. At 1225 your fix is 011°T, 3.6 nm from Westfield church spire. You steer 133°T at 6.7 kn through the water. At 1320 a new fix puts you 351°T, 3.5 nm from Mill stack.

   Plot the 1320 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 0805 your fix is 006°T, 2.5 nm from Tern Island tower. You steer 266°T at 5.2 kn through the water. At 0855 a new fix puts you 022°T, 3.4 nm from Westfield church spire.

   Plot the 0855 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0705 your fix is 016°T, 3.1 nm from Westfield church spire. You steer 128°T at 5.0 kn through the water. At 0735 a new fix puts you 068°T, 2.1 nm from Westfield church spire.

   Plot the 0735 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 1230 your fix is 005°T, 1.1 nm from Kittle water tank. You steer 271°T at 7.7 kn through the water. At 1320 a new fix puts you 073°T, 1.2 nm from Heron Point Light.

   Plot the 1320 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0820 your fix is 257°T, 2.5 nm from Tern Island tower. You steer 019°T at 4.0 kn through the water. At 0850 a new fix puts you 298°T, 2.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0900 your fix is 276°T, 2.5 nm from Tern Island tower. You steer 233°T at 4.1 kn through the water. At 0935 a new fix puts you 041°T, 3.4 nm from Heron Point Light.

   Plot the 0935 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 1230 your fix is 055°T, 2.3 nm from Westfield church spire. You steer 115°T at 5.4 kn through the water. At 1355 a new fix puts you 208°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1355 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1105 your fix is 326°T, 1.4 nm from Gannet Rock daybeacon. You steer 060°T at 5.5 kn through the water. At 1145 a new fix puts you 038°T, 4.8 nm from Gannet Rock daybeacon.

   Plot the 1145 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