Worksheet 521 · Skill 5

Set and drift

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1. At 0900 your fix is 352°T, 2.5 nm from Mill stack. You steer 343°T at 4.3 kn through the water. At 1000 a new fix puts you 065°T, 2.8 nm from Westfield church spire.

   Plot the 1000 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  

2. At 1120 your fix is 031°T, 2.4 nm from Mill stack. You steer 330°T at 5.1 kn through the water. At 1235 a new fix puts you 010°T, 3.6 nm from Westfield church spire.

   Plot the 1235 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 1420 your fix is 117°T, 1.0 nm from Gannet Rock daybeacon. You steer 266°T at 7.7 kn through the water. At 1450 a new fix puts you 255°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1450 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 1245 your fix is 275°T, 2.9 nm from Tern Island tower. You steer 141°T at 6.9 kn through the water. At 1320 a new fix puts you 204°T, 2.3 nm from Tern Island tower.

   Plot the 1320 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 1420 your fix is 050°T, 1.7 nm from Gannet Rock daybeacon. You steer 340°T at 4.7 kn through the water. At 1500 a new fix puts you 060°T, 4.0 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0935 your fix is 068°T, 2.1 nm from Westfield church spire. You steer 100°T at 4.7 kn through the water. At 1015 a new fix puts you 260°T, 2.5 nm from Tern Island tower.

   Plot the 1015 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 0945 your fix is 055°T, 2.7 nm from Westfield church spire. You steer 131°T at 6.1 kn through the water. At 1040 a new fix puts you 236°T, 2.9 nm from Tern Island tower.

   Plot the 1040 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 1500 your fix is 228°T, 3.0 nm from Tern Island tower. You steer 248°T at 5.4 kn through the water. At 1540 a new fix puts you 357°T, 1.7 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn