Worksheet 811 · Skill 5

Set and drift

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1. At 0835 your fix is 324°T, 3.1 nm from Tern Island tower. You steer 256°T at 4.3 kn through the water. At 0930 a new fix puts you 016°T, 2.5 nm from Westfield church spire.

   Plot the 0930 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  

2. At 1000 your fix is 274°T, 2.7 nm from Tern Island tower. You steer 255°T at 4.2 kn through the water. At 1035 a new fix puts you 078°T, 3.1 nm from Westfield church spire.

   Plot the 1035 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  

3. At 0805 your fix is 261°T, 2.4 nm from Gannet Rock daybeacon. You steer 096°T at 7.9 kn through the water. At 0835 a new fix puts you 014°T, 1.9 nm from Kittle water tank.

   Plot the 0835 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 1320 your fix is 011°T, 2.9 nm from Westfield church spire. You steer 102°T at 5.1 kn through the water. At 1350 a new fix puts you 040°T, 4.0 nm from Westfield church spire.

   Plot the 1350 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 1230 your fix is 031°T, 2.7 nm from Tern Island tower. You steer 256°T at 6.7 kn through the water. At 1335 a new fix puts you 060°T, 2.7 nm from Westfield church spire.

   Plot the 1335 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 1010 your fix is 030°T, 2.2 nm from Gannet Rock daybeacon. You steer 236°T at 5.3 kn through the water. At 1045 a new fix puts you 175°T, 1.4 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0815 your fix is 079°T, 1.7 nm from Westfield church spire. You steer 071°T at 8.0 kn through the water. At 0850 a new fix puts you 303°T, 2.1 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0725 your fix is 305°T, 4.1 nm from Tern Island tower. You steer 216°T at 4.3 kn through the water. At 0800 a new fix puts you 043°T, 2.3 nm from Westfield church spire.

   Plot the 0800 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