Worksheet 775 · Skill 5

Set and drift

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1. At 0700 your fix is 100°T, 2.1 nm from Tern Island tower. You steer 325°T at 4.4 kn through the water. At 0740 a new fix puts you 004°T, 2.3 nm from Tern Island tower.

   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  

2. At 0710 your fix is 301°T, 3.6 nm from Tern Island tower. You steer 168°T at 6.6 kn through the water. At 0805 a new fix puts you 231°T, 2.4 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1110 your fix is 085°T, 3.0 nm from Westfield church spire. You steer 339°T at 5.8 kn through the water. At 1140 a new fix puts you 050°T, 3.5 nm from Westfield church spire.

   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  

4. At 1020 your fix is 067°T, 1.9 nm from Heron Point Light. You steer 042°T at 7.9 kn through the water. At 1050 a new fix puts you 215°T, 1.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1315 your fix is 296°T, 4.1 nm from Tern Island tower. You steer 101°T at 4.8 kn through the water. At 1355 a new fix puts you 025°T, 1.8 nm from Tern Island tower.

   Plot the 1355 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  

6. At 1035 your fix is 060°T, 3.4 nm from Westfield church spire. You steer 080°T at 6.2 kn through the water. At 1105 a new fix puts you 283°T, 1.9 nm from Tern Island tower.

   Plot the 1105 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  

7. At 1210 your fix is 289°T, 1.7 nm from Gannet Rock daybeacon. You steer 250°T at 4.6 kn through the water. At 1320 a new fix puts you 328°T, 2.0 nm from Mill stack.

   Plot the 1320 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 1415 your fix is 055°T, 3.3 nm from Heron Point Light. You steer 272°T at 8.5 kn through the water. At 1445 a new fix puts you 145°T, 1.2 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