Worksheet 785 · Skill 5

Set and drift

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1. At 0915 your fix is 319°T, 1.1 nm from Tern Island tower. You steer 294°T at 4.5 kn through the water. At 1005 a new fix puts you 043°T, 2.9 nm from Westfield church spire.

   Plot the 1005 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  

2. At 1115 your fix is 050°T, 2.1 nm from Westfield church spire. You steer 178°T at 5.3 kn through the water. At 1155 a new fix puts you 323°T, 1.9 nm from Heron Point Light.

   Plot the 1155 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 0850 your fix is 243°T, 2.3 nm from Tern Island tower. You steer 228°T at 6.0 kn through the water. At 0930 a new fix puts you 090°T, 1.5 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1510 your fix is 261°T, 2.4 nm from Tern Island tower. You steer 293°T at 4.2 kn through the water. At 1600 a new fix puts you 047°T, 1.8 nm from Westfield church spire.

   Plot the 1600 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 1245 your fix is 218°T, 3.1 nm from Tern Island tower. You steer 276°T at 4.7 kn through the water. At 1320 a new fix puts you 032°T, 1.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0710 your fix is 023°T, 1.7 nm from Kittle water tank. You steer 275°T at 7.2 kn through the water. At 0815 a new fix puts you 011°T, 2.0 nm from Heron Point Light.

   Plot the 0815 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  

7. At 1310 your fix is 307°T, 3.8 nm from Tern Island tower. You steer 166°T at 5.9 kn through the water. At 1345 a new fix puts you 246°T, 3.0 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1255 your fix is 072°T, 1.4 nm from Heron Point Light. You steer 082°T at 5.9 kn through the water. At 1355 a new fix puts you 312°T, 1.1 nm from Kittle water tank.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn