Worksheet 278 · Skill 5

Set and drift

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1. At 1055 your fix is 302°T, 1.7 nm from Tern Island tower. You steer 282°T at 7.2 kn through the water. At 1140 a new fix puts you 042°T, 3.2 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1410 your fix is 055°T, 2.2 nm from Heron Point Light. You steer 032°T at 5.6 kn through the water. At 1455 a new fix puts you 217°T, 1.8 nm from Tern Island tower.

   Plot the 1455 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 1335 your fix is 262°T, 1.8 nm from Gannet Rock daybeacon. You steer 286°T at 4.1 kn through the water. At 1405 a new fix puts you 233°T, 2.8 nm from Tern Island tower.

   Plot the 1405 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 1425 your fix is 214°T, 1.8 nm from Gannet Rock daybeacon. You steer 348°T at 4.5 kn through the water. At 1500 a new fix puts you 216°T, 1.9 nm from Tern Island tower.

   Plot the 1500 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 0930 your fix is 056°T, 2.5 nm from Westfield church spire. You steer 080°T at 6.1 kn through the water. At 1010 a new fix puts you 283°T, 1.2 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1120 your fix is 227°T, 1.9 nm from Tern Island tower. You steer 282°T at 5.1 kn through the water. At 1210 a new fix puts you 097°T, 2.7 nm from Westfield church spire.

   Plot the 1210 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  

7. At 0715 your fix is 250°T, 2.7 nm from Gannet Rock daybeacon. You steer 299°T at 7.6 kn through the water. At 0810 a new fix puts you 023°T, 3.2 nm from Westfield church spire.

   Plot the 0810 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 0940 your fix is 003°T, 3.1 nm from Mill stack. You steer 345°T at 6.8 kn through the water. At 1030 a new fix puts you 324°T, 2.6 nm from Tern Island tower.

   Plot the 1030 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