Worksheet 187 · Skill 5

Set and drift

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1. At 1335 your fix is 042°T, 3.2 nm from Gannet Rock daybeacon. You steer 239°T at 7.4 kn through the water. At 1440 a new fix puts you 059°T, 3.0 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  

2. At 0910 your fix is 204°T, 2.5 nm from Tern Island tower. You steer 273°T at 7.7 kn through the water. At 0950 a new fix puts you 182°T, 1.0 nm from Westfield church spire.

   Plot the 0950 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  

3. At 1330 your fix is 058°T, 4.1 nm from Tern Island tower. You steer 264°T at 4.2 kn through the water. At 1405 a new fix puts you 015°T, 2.2 nm from Tern Island tower.

   Plot the 1405 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 0830 your fix is 070°T, 4.1 nm from Tern Island tower. You steer 196°T at 4.2 kn through the water. At 0930 a new fix puts you 086°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0930 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  

5. At 1415 your fix is 206°T, 1.5 nm from Tern Island tower. You steer 272°T at 8.6 kn through the water. At 1445 a new fix puts you 092°T, 2.0 nm from Westfield church spire.

   Plot the 1445 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 1220 your fix is 043°T, 1.7 nm from Tern Island tower. You steer 277°T at 6.3 kn through the water. At 1310 a new fix puts you 287°T, 3.6 nm from Tern Island tower.

   Plot the 1310 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  

7. At 0920 your fix is 333°T, 1.3 nm from Heron Point Light. You steer 077°T at 6.1 kn through the water. At 1030 a new fix puts you 248°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1030 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  

8. At 1210 your fix is 274°T, 2.0 nm from Tern Island tower. You steer 248°T at 4.4 kn through the water. At 1300 a new fix puts you 104°T, 2.5 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn