Worksheet 295 · Skill 5

Set and drift

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1. At 0920 your fix is 266°T, 3.5 nm from Tern Island tower. You steer 115°T at 4.8 kn through the water. At 0955 a new fix puts you 222°T, 2.4 nm from Tern Island tower.

   Plot the 0955 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 1125 your fix is 048°T, 3.0 nm from Tern Island tower. You steer 255°T at 6.0 kn through the water. At 1240 a new fix puts you 286°T, 3.9 nm from Tern Island tower.

   Plot the 1240 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0940 your fix is 020°T, 1.7 nm from Westfield church spire. You steer 166°T at 7.3 kn through the water. At 1015 a new fix puts you 342°T, 1.6 nm from Heron Point Light.

   Plot the 1015 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 1520 your fix is 068°T, 3.9 nm from Tern Island tower. You steer 153°T at 4.3 kn through the water. At 1605 a new fix puts you 079°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1605 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  

5. At 0820 your fix is 088°T, 1.2 nm from Heron Point Light. You steer 073°T at 4.4 kn through the water. At 0915 a new fix puts you 005°T, 3.3 nm from Mill stack.

   Plot the 0915 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  

6. At 1320 your fix is 241°T, 1.3 nm from Tern Island tower. You steer 179°T at 6.9 kn through the water. At 1400 a new fix puts you 020°T, 1.3 nm from Mill stack.

   Plot the 1400 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  

7. At 1035 your fix is 247°T, 1.6 nm from Tern Island tower. You steer 297°T at 8.3 kn through the water. At 1105 a new fix puts you 020°T, 2.9 nm from Westfield church spire.

   Plot the 1105 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  

8. At 0725 your fix is 013°T, 3.4 nm from Westfield church spire. You steer 187°T at 5.1 kn through the water. At 0755 a new fix puts you 038°T, 1.8 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn