Worksheet 776 · Skill 5

Set and drift

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1. At 1220 your fix is 273°T, 3.0 nm from Tern Island tower. You steer 153°T at 8.3 kn through the water. At 1300 a new fix puts you 032°T, 1.8 nm from Mill stack.

   Plot the 1300 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 1145 your fix is 240°T, 3.4 nm from Tern Island tower. You steer 112°T at 5.8 kn through the water. At 1250 a new fix puts you 028°T, 0.9 nm from Kittle water tank.

   Plot the 1250 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  

3. At 0955 your fix is 078°T, 1.8 nm from Tern Island tower. You steer 191°T at 4.9 kn through the water. At 1100 a new fix puts you 055°T, 2.2 nm from Mill stack.

   Plot the 1100 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  

4. At 1315 your fix is 236°T, 2.0 nm from Tern Island tower. You steer 175°T at 4.2 kn through the water. At 1355 a new fix puts you 000°T, 2.7 nm from Mill stack.

   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  

5. At 1310 your fix is 198°T, 1.7 nm from Gannet Rock daybeacon. You steer 276°T at 5.3 kn through the water. At 1350 a new fix puts you 011°T, 2.1 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1350 your fix is 054°T, 4.1 nm from Tern Island tower. You steer 188°T at 5.5 kn through the water. At 1435 a new fix puts you 036°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1435 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  

7. At 1310 your fix is 062°T, 2.6 nm from Gannet Rock daybeacon. You steer 254°T at 6.8 kn through the water. At 1415 a new fix puts you 144°T, 3.4 nm from Westfield church spire.

   Plot the 1415 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  

8. At 0705 your fix is 263°T, 1.9 nm from Tern Island tower. You steer 179°T at 7.4 kn through the water. At 0740 a new fix puts you 342°T, 1.4 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn