Worksheet 368 · Skill 5

Set and drift

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1. At 0730 your fix is 325°T, 2.8 nm from Kittle water tank. You steer 249°T at 8.4 kn through the water. At 0805 a new fix puts you 093°T, 2.1 nm from Heron Point Light.

   Plot the 0805 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  

2. At 1005 your fix is 055°T, 3.3 nm from Tern Island tower. You steer 168°T at 7.0 kn through the water. At 1050 a new fix puts you 070°T, 2.9 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  

3. At 0820 your fix is 020°T, 1.2 nm from Tern Island tower. You steer 063°T at 5.8 kn through the water. At 0850 a new fix puts you 046°T, 3.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0905 your fix is 261°T, 1.9 nm from Tern Island tower. You steer 145°T at 5.6 kn through the water. At 0940 a new fix puts you 278°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0940 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  

5. At 1245 your fix is 009°T, 1.7 nm from Gannet Rock daybeacon. You steer 259°T at 7.3 kn through the water. At 1345 a new fix puts you 041°T, 3.4 nm from Heron Point Light.

   Plot the 1345 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  

6. At 1125 your fix is 296°T, 3.9 nm from Tern Island tower. You steer 135°T at 4.0 kn through the water. At 1235 a new fix puts you 035°T, 2.1 nm from Mill stack.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1330 your fix is 216°T, 2.4 nm from Tern Island tower. You steer 285°T at 6.0 kn through the water. At 1415 a new fix puts you 091°T, 2.9 nm from Westfield church spire.

   Plot the 1415 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  

8. At 1110 your fix is 060°T, 1.3 nm from Heron Point Light. You steer 092°T at 8.8 kn through the water. At 1200 a new fix puts you 323°T, 1.0 nm from Kittle water tank.

   Plot the 1200 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