Worksheet 611 · Skill 5

Set and drift

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1. At 0715 your fix is 337°T, 1.8 nm from Heron Point Light. You steer 045°T at 5.0 kn through the water. At 0820 a new fix puts you 298°T, 4.1 nm from Tern Island tower.

   Plot the 0820 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  

2. At 1310 your fix is 225°T, 1.7 nm from Tern Island tower. You steer 290°T at 4.5 kn through the water. At 1340 a new fix puts you 258°T, 2.4 nm from Tern Island tower.

   Plot the 1340 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 1115 your fix is 115°T, 2.3 nm from Westfield church spire. You steer 121°T at 8.0 kn through the water. At 1150 a new fix puts you 002°T, 1.4 nm from Mill stack.

   Plot the 1150 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 1540 your fix is 331°T, 2.5 nm from Tern Island tower. You steer 228°T at 5.4 kn through the water. At 1625 a new fix puts you 063°T, 3.0 nm from Westfield church spire.

   Plot the 1625 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 1255 your fix is 358°T, 1.6 nm from Heron Point Light. You steer 359°T at 4.3 kn through the water. At 1400 a new fix puts you 075°T, 1.5 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1120 your fix is 317°T, 1.4 nm from Kittle water tank. You steer 313°T at 5.4 kn through the water. At 1220 a new fix puts you 224°T, 1.9 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1510 your fix is 035°T, 2.2 nm from Mill stack. You steer 330°T at 4.0 kn through the water. At 1600 a new fix puts you 241°T, 2.0 nm from Tern Island tower.

   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  

8. At 1255 your fix is 356°T, 2.0 nm from Heron Point Light. You steer 119°T at 4.9 kn through the water. At 1350 a new fix puts you 259°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1350 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