Worksheet 80 · Skill 5

Set and drift

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1. At 1040 your fix is 263°T, 2.6 nm from Tern Island tower. You steer 135°T at 8.1 kn through the water. At 1115 a new fix puts you 260°T, 1.8 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1125 your fix is 139°T, 2.6 nm from Tern Island tower. You steer 287°T at 8.0 kn through the water. At 1225 a new fix puts you 051°T, 2.6 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1110 your fix is 269°T, 2.5 nm from Tern Island tower. You steer 312°T at 4.5 kn through the water. At 1145 a new fix puts you 055°T, 3.9 nm from Westfield church spire.

   Plot the 1145 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  

4. At 0850 your fix is 029°T, 2.6 nm from Tern Island tower. You steer 244°T at 5.5 kn through the water. At 1000 a new fix puts you 296°T, 2.8 nm from Tern Island tower.

   Plot the 1000 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  

5. At 1445 your fix is 301°T, 3.1 nm from Tern Island tower. You steer 247°T at 4.1 kn through the water. At 1550 a new fix puts you 078°T, 1.6 nm from Westfield church spire.

   Plot the 1550 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  

6. At 1045 your fix is 026°T, 1.9 nm from Heron Point Light. You steer 042°T at 5.1 kn through the water. At 1205 a new fix puts you 331°T, 2.5 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1235 your fix is 073°T, 2.2 nm from Heron Point Light. You steer 336°T at 5.5 kn through the water. At 1315 a new fix puts you 066°T, 2.2 nm from Westfield church spire.

   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  

8. At 0925 your fix is 049°T, 1.2 nm from Westfield church spire. You steer 080°T at 5.5 kn through the water. At 1020 a new fix puts you 257°T, 3.3 nm from Tern Island tower.

   Plot the 1020 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