Worksheet 504 · Skill 5

Set and drift

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1. At 1005 your fix is 022°T, 2.8 nm from Westfield church spire. You steer 135°T at 5.9 kn through the water. At 1045 a new fix puts you 035°T, 2.5 nm from Heron Point Light.

   Plot the 1045 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 0910 your fix is 212°T, 2.6 nm from Tern Island tower. You steer 081°T at 4.4 kn through the water. At 1035 a new fix puts you 050°T, 3.5 nm from Gannet Rock daybeacon.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1300 your fix is 058°T, 2.3 nm from Westfield church spire. You steer 119°T at 5.4 kn through the water. At 1345 a new fix puts you 216°T, 2.3 nm from Tern Island tower.

   Plot the 1345 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 1240 your fix is 227°T, 2.2 nm from Tern Island tower. You steer 144°T at 4.3 kn through the water. At 1335 a new fix puts you 213°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1335 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 1100 your fix is 019°T, 2.5 nm from Mill stack. You steer 349°T at 5.1 kn through the water. At 1140 a new fix puts you 268°T, 2.8 nm from Tern Island tower.

   Plot the 1140 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  

6. At 0935 your fix is 262°T, 2.5 nm from Tern Island tower. You steer 050°T at 4.1 kn through the water. At 1030 a new fix puts you 308°T, 2.3 nm from Tern Island tower.

   Plot the 1030 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  

7. At 1420 your fix is 028°T, 1.3 nm from Kittle water tank. You steer 353°T at 4.3 kn through the water. At 1540 a new fix puts you 007°T, 2.6 nm from Tern Island tower.

   Plot the 1540 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0955 your fix is 183°T, 1.9 nm from Tern Island tower. You steer 271°T at 4.0 kn through the water. At 1100 a new fix puts you 060°T, 1.9 nm from Westfield church spire.

   Plot the 1100 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn