Worksheet 602 · Skill 5

Set and drift

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1. At 0700 your fix is 275°T, 2.2 nm from Tern Island tower. You steer 152°T at 7.0 kn through the water. At 0750 a new fix puts you 223°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0750 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 0800 your fix is 031°T, 2.5 nm from Mill stack. You steer 316°T at 4.9 kn through the water. At 0915 a new fix puts you 054°T, 3.4 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0700 your fix is 069°T, 3.7 nm from Tern Island tower. You steer 224°T at 5.1 kn through the water. At 0805 a new fix puts you 008°T, 2.7 nm from Mill stack.

   Plot the 0805 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 1540 your fix is 032°T, 3.6 nm from Westfield church spire. You steer 137°T at 5.8 kn through the water. At 1710 a new fix puts you 292°T, 2.1 nm from Kittle water tank.

   Plot the 1710 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1410 your fix is 097°T, 2.1 nm from Westfield church spire. You steer 060°T at 5.0 kn through the water. At 1540 a new fix puts you 014°T, 1.8 nm from Tern Island tower.

   Plot the 1540 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0740 your fix is 050°T, 3.9 nm from Tern Island tower. You steer 179°T at 5.5 kn through the water. At 0825 a new fix puts you 084°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 0825 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 1010 your fix is 345°T, 1.7 nm from Mill stack. You steer 357°T at 5.8 kn through the water. At 1100 a new fix puts you 238°T, 2.6 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1230 your fix is 071°T, 2.6 nm from Westfield church spire. You steer 061°T at 6.5 kn through the water. At 1310 a new fix puts you 308°T, 3.1 nm from Tern Island tower.

   Plot the 1310 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