Worksheet 664 · Skill 5

Set and drift

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1. At 0710 your fix is 232°T, 2.8 nm from Tern Island tower. You steer 312°T at 4.6 kn through the water. At 0740 a new fix puts you 070°T, 2.3 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1425 your fix is 070°T, 4.6 nm from Tern Island tower. You steer 200°T at 7.7 kn through the water. At 1510 a new fix puts you 007°T, 1.1 nm from Kittle water tank.

   Plot the 1510 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 1245 your fix is 218°T, 2.5 nm from Gannet Rock daybeacon. You steer 269°T at 6.9 kn through the water. At 1325 a new fix puts you 096°T, 2.0 nm from Heron Point Light.

   Plot the 1325 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  

4. At 0850 your fix is 228°T, 2.1 nm from Tern Island tower. You steer 297°T at 7.2 kn through the water. At 0940 a new fix puts you 004°T, 1.9 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0755 your fix is 030°T, 2.3 nm from Kittle water tank. You steer 005°T at 5.5 kn through the water. At 0850 a new fix puts you 034°T, 3.6 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0820 your fix is 107°T, 2.5 nm from Westfield church spire. You steer 103°T at 4.7 kn through the water. At 0905 a new fix puts you 222°T, 2.9 nm from Tern Island tower.

   Plot the 0905 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  

7. At 0845 your fix is 258°T, 1.9 nm from Gannet Rock daybeacon. You steer 263°T at 4.6 kn through the water. At 0940 a new fix puts you 013°T, 0.8 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1110 your fix is 347°T, 2.4 nm from Mill stack. You steer 067°T at 4.0 kn through the water. At 1205 a new fix puts you 141°T, 1.5 nm from Tern Island tower.

   Plot the 1205 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn