Worksheet 153 · Skill 5

Set and drift

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1. At 1255 your fix is 172°T, 1.2 nm from Gannet Rock daybeacon. You steer 265°T at 4.3 kn through the water. At 1350 a new fix puts you 334°T, 2.2 nm from Mill stack.

   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  

2. At 1145 your fix is 035°T, 1.7 nm from Westfield church spire. You steer 116°T at 5.2 kn through the water. At 1220 a new fix puts you 084°T, 3.5 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 1050 your fix is 284°T, 3.3 nm from Tern Island tower. You steer 261°T at 5.1 kn through the water. At 1140 a new fix puts you 045°T, 1.2 nm from Westfield church spire.

   Plot the 1140 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  

4. At 1135 your fix is 021°T, 2.4 nm from Gannet Rock daybeacon. You steer 029°T at 4.3 kn through the water. At 1220 a new fix puts you 066°T, 4.8 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1120 your fix is 003°T, 2.6 nm from Westfield church spire. You steer 133°T at 7.2 kn through the water. At 1225 a new fix puts you 355°T, 2.4 nm from Mill stack.

   Plot the 1225 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 1220 your fix is 263°T, 2.5 nm from Gannet Rock daybeacon. You steer 302°T at 7.9 kn through the water. At 1300 a new fix puts you 030°T, 2.8 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0945 your fix is 298°T, 2.5 nm from Tern Island tower. You steer 244°T at 4.1 kn through the water. At 1040 a new fix puts you 006°T, 2.0 nm from Heron Point Light.

   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 1350 your fix is 283°T, 2.5 nm from Tern Island tower. You steer 217°T at 4.7 kn through the water. At 1500 a new fix puts you 351°T, 1.8 nm from Heron Point Light.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn