Worksheet 932 · Skill 5

Set and drift

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1. At 1450 your fix is 070°T, 2.9 nm from Westfield church spire. You steer 057°T at 4.8 kn through the water. At 1540 a new fix puts you 309°T, 1.2 nm from Tern Island tower.

   Plot the 1540 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  

2. At 0705 your fix is 213°T, 1.6 nm from Tern Island tower. You steer 244°T at 6.1 kn through the water. At 0735 a new fix puts you 059°T, 2.5 nm from Heron Point Light.

   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  

3. At 0920 your fix is 025°T, 1.5 nm from Heron Point Light. You steer 096°T at 6.7 kn through the water. At 1010 a new fix puts you 241°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1010 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 1005 your fix is 005°T, 2.9 nm from Mill stack. You steer 058°T at 4.0 kn through the water. At 1050 a new fix puts you 351°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1050 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 0845 your fix is 061°T, 3.6 nm from Tern Island tower. You steer 187°T at 7.7 kn through the water. At 0920 a new fix puts you 019°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 0920 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 1120 your fix is 319°T, 1.6 nm from Kittle water tank. You steer 297°T at 4.3 kn through the water. At 1225 a new fix puts you 273°T, 2.6 nm from Tern Island tower.

   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  

7. At 1350 your fix is 003°T, 2.2 nm from Mill stack. You steer 350°T at 6.2 kn through the water. At 1450 a new fix puts you 278°T, 2.7 nm from Tern Island tower.

   Plot the 1450 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 1235 your fix is 276°T, 3.3 nm from Tern Island tower. You steer 213°T at 6.5 kn through the water. At 1315 a new fix puts you 327°T, 1.4 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn