Worksheet 21 · Skill 5

Set and drift

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1. At 1220 your fix is 031°T, 1.8 nm from Westfield church spire. You steer 115°T at 5.7 kn through the water. At 1250 a new fix puts you 262°T, 3.5 nm from Tern Island tower.

   Plot the 1250 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  

2. At 0800 your fix is 041°T, 3.1 nm from Heron Point Light. You steer 257°T at 4.2 kn through the water. At 0830 a new fix puts you 123°T, 2.1 nm from Westfield church spire.

   Plot the 0830 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  

3. At 1245 your fix is 305°T, 4.2 nm from Tern Island tower. You steer 172°T at 4.5 kn through the water. At 1330 a new fix puts you 065°T, 3.5 nm from Westfield church spire.

   Plot the 1330 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 0705 your fix is 357°T, 2.0 nm from Tern Island tower. You steer 252°T at 5.2 kn through the water. At 0830 a new fix puts you 116°T, 1.9 nm from Westfield church spire.

   Plot the 0830 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  

5. At 1405 your fix is 050°T, 3.9 nm from Gannet Rock daybeacon. You steer 217°T at 6.0 kn through the water. At 1500 a new fix puts you 352°T, 1.5 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1245 your fix is 305°T, 3.8 nm from Tern Island tower. You steer 215°T at 7.5 kn through the water. At 1325 a new fix puts you 329°T, 1.7 nm from Heron Point Light.

   Plot the 1325 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 1600 your fix is 022°T, 3.7 nm from Westfield church spire. You steer 149°T at 5.5 kn through the water. At 1710 a new fix puts you 093°T, 2.8 nm from Westfield church spire.

   Plot the 1710 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1210 your fix is 089°T, 1.9 nm from Heron Point Light. You steer 005°T at 5.4 kn through the water. At 1250 a new fix puts you 043°T, 3.2 nm from Heron Point Light.

   Plot the 1250 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