Worksheet 458 · Skill 5

Set and drift

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1. At 1040 your fix is 058°T, 3.3 nm from Westfield church spire. You steer 190°T at 4.1 kn through the water. At 1120 a new fix puts you 346°T, 1.3 nm from Heron Point Light.

   Plot the 1120 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 1110 your fix is 055°T, 3.7 nm from Westfield church spire. You steer 163°T at 7.4 kn through the water. At 1145 a new fix puts you 037°T, 2.8 nm from Heron Point Light.

   Plot the 1145 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 1600 your fix is 058°T, 2.8 nm from Westfield church spire. You steer 181°T at 4.8 kn through the water. At 1635 a new fix puts you 353°T, 1.9 nm from Heron Point Light.

   Plot the 1635 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 0705 your fix is 268°T, 3.5 nm from Tern Island tower. You steer 319°T at 6.1 kn through the water. At 0735 a new fix puts you 016°T, 3.6 nm from Westfield church spire.

   Plot the 0735 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 1030 your fix is 032°T, 2.2 nm from Mill stack. You steer 322°T at 8.2 kn through the water. At 1125 a new fix puts you 064°T, 2.7 nm from Westfield church spire.

   Plot the 1125 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 1230 your fix is 018°T, 2.8 nm from Mill stack. You steer 118°T at 4.2 kn through the water. At 1300 a new fix puts you 283°T, 2.4 nm from Kittle water tank.

   Plot the 1300 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 0945 your fix is 035°T, 0.9 nm from Gannet Rock daybeacon. You steer 277°T at 5.6 kn through the water. At 1040 a new fix puts you 225°T, 1.7 nm from Tern Island tower.

   Plot the 1040 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  

8. At 1100 your fix is 358°T, 1.4 nm from Heron Point Light. You steer 028°T at 6.3 kn through the water. At 1145 a new fix puts you 273°T, 2.9 nm from Tern Island tower.

   Plot the 1145 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