Worksheet 850 · Skill 5

Set and drift

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1. At 0805 your fix is 026°T, 1.9 nm from Tern Island tower. You steer 151°T at 7.1 kn through the water. At 0850 a new fix puts you 039°T, 2.2 nm from Kittle water tank.

   Plot the 0850 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 0920 your fix is 030°T, 1.6 nm from Gannet Rock daybeacon. You steer 237°T at 5.7 kn through the water. At 1025 a new fix puts you 061°T, 1.6 nm from Heron Point Light.

   Plot the 1025 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  

3. At 1225 your fix is 227°T, 2.5 nm from Gannet Rock daybeacon. You steer 310°T at 6.3 kn through the water. At 1315 a new fix puts you 261°T, 2.9 nm from Tern Island tower.

   Plot the 1315 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 1110 your fix is 215°T, 1.2 nm from Gannet Rock daybeacon. You steer 283°T at 7.7 kn through the water. At 1140 a new fix puts you 238°T, 3.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0910 your fix is 120°T, 1.3 nm from Gannet Rock daybeacon. You steer 241°T at 4.0 kn through the water. At 0945 a new fix puts you 217°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0945 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  

6. At 0700 your fix is 028°T, 2.7 nm from Kittle water tank. You steer 331°T at 7.2 kn through the water. At 0740 a new fix puts you 022°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0740 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 1015 your fix is 052°T, 3.3 nm from Heron Point Light. You steer 330°T at 4.7 kn through the water. At 1115 a new fix puts you 048°T, 3.2 nm from Westfield church spire.

   Plot the 1115 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  

8. At 1410 your fix is 003°T, 2.0 nm from Tern Island tower. You steer 119°T at 4.5 kn through the water. At 1455 a new fix puts you 043°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1455 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