Worksheet 197 · Skill 5

Set and drift

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1. At 1150 your fix is 039°T, 4.8 nm from Gannet Rock daybeacon. You steer 177°T at 5.4 kn through the water. At 1235 a new fix puts you 099°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1235 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  

2. At 0820 your fix is 051°T, 3.1 nm from Heron Point Light. You steer 085°T at 6.8 kn through the water. At 0855 a new fix puts you 007°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0855 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 1245 your fix is 067°T, 4.7 nm from Tern Island tower. You steer 269°T at 5.0 kn through the water. At 1355 a new fix puts you 327°T, 2.8 nm from Tern Island tower.

   Plot the 1355 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  

4. At 1535 your fix is 254°T, 3.4 nm from Tern Island tower. You steer 129°T at 5.5 kn through the water. At 1625 a new fix puts you 211°T, 2.2 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1225 your fix is 091°T, 3.3 nm from Westfield church spire. You steer 354°T at 5.8 kn through the water. At 1255 a new fix puts you 043°T, 3.7 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1335 your fix is 053°T, 4.0 nm from Westfield church spire. You steer 170°T at 4.4 kn through the water. At 1440 a new fix puts you 024°T, 2.7 nm from Heron Point Light.

   Plot the 1440 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  

7. At 1145 your fix is 038°T, 2.1 nm from Mill stack. You steer 337°T at 8.3 kn through the water. At 1220 a new fix puts you 245°T, 1.7 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1550 your fix is 195°T, 1.6 nm from Gannet Rock daybeacon. You steer 297°T at 6.5 kn through the water. At 1640 a new fix puts you 016°T, 2.0 nm from Heron Point Light.

   Plot the 1640 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