Worksheet 246 · Skill 5

Set and drift

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1. At 1240 your fix is 023°T, 3.5 nm from Westfield church spire. You steer 146°T at 7.1 kn through the water. At 1330 a new fix puts you 062°T, 2.7 nm from Heron Point Light.

   Plot the 1330 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  

2. At 1020 your fix is 055°T, 2.3 nm from Heron Point Light. You steer 003°T at 6.6 kn through the water. At 1110 a new fix puts you 305°T, 3.6 nm from Tern Island tower.

   Plot the 1110 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  

3. At 1350 your fix is 301°T, 3.4 nm from Tern Island tower. You steer 206°T at 5.9 kn through the water. At 1420 a new fix puts you 249°T, 3.6 nm from Tern Island tower.

   Plot the 1420 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 0805 your fix is 027°T, 1.5 nm from Kittle water tank. You steer 295°T at 8.6 kn through the water. At 0915 a new fix puts you 089°T, 3.6 nm from Westfield church spire.

   Plot the 0915 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 0820 your fix is 056°T, 3.9 nm from Westfield church spire. You steer 145°T at 6.0 kn through the water. At 0905 a new fix puts you 222°T, 3.2 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  

6. At 1005 your fix is 044°T, 4.6 nm from Westfield church spire. You steer 181°T at 4.7 kn through the water. At 1045 a new fix puts you 062°T, 2.9 nm from Westfield church spire.

   Plot the 1045 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  

7. At 1505 your fix is 002°T, 1.1 nm from Kittle water tank. You steer 353°T at 4.4 kn through the water. At 1605 a new fix puts you 076°T, 3.2 nm from Tern Island tower.

   Plot the 1605 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  

8. At 1335 your fix is 323°T, 2.8 nm from Kittle water tank. You steer 096°T at 4.0 kn through the water. At 1410 a new fix puts you 026°T, 2.2 nm from Kittle water tank.

   Plot the 1410 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