Worksheet 845 · Skill 5

Set and drift

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1. At 1440 your fix is 020°T, 3.6 nm from Westfield church spire. You steer 129°T at 7.5 kn through the water. At 1510 a new fix puts you 280°T, 3.6 nm from Tern Island tower.

   Plot the 1510 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 1145 your fix is 307°T, 3.5 nm from Tern Island tower. You steer 201°T at 4.0 kn through the water. At 1220 a new fix puts you 067°T, 3.3 nm from Westfield church spire.

   Plot the 1220 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  

3. At 1215 your fix is 068°T, 3.1 nm from Westfield church spire. You steer 105°T at 5.4 kn through the water. At 1255 a new fix puts you 249°T, 1.7 nm from Tern Island tower.

   Plot the 1255 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 1145 your fix is 192°T, 1.8 nm from Gannet Rock daybeacon. You steer 282°T at 8.0 kn through the water. At 1215 a new fix puts you 358°T, 2.1 nm from Mill stack.

   Plot the 1215 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  

5. At 0740 your fix is 357°T, 1.6 nm from Heron Point Light. You steer 035°T at 6.6 kn through the water. At 0835 a new fix puts you 293°T, 2.6 nm from Tern Island tower.

   Plot the 0835 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 1355 your fix is 064°T, 1.3 nm from Gannet Rock daybeacon. You steer 358°T at 4.0 kn through the water. At 1425 a new fix puts you 081°T, 1.9 nm from Tern Island tower.

   Plot the 1425 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  

7. At 1150 your fix is 291°T, 2.3 nm from Kittle water tank. You steer 035°T at 4.7 kn through the water. At 1315 a new fix puts you 054°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1315 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 1015 your fix is 359°T, 0.9 nm from Heron Point Light. You steer 102°T at 5.6 kn through the water. At 1100 a new fix puts you 263°T, 3.1 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn