Worksheet 819 · Skill 5

Set and drift

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1. At 0800 your fix is 355°T, 2.8 nm from Mill stack. You steer 293°T at 5.0 kn through the water. At 0850 a new fix puts you 015°T, 1.2 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0810 your fix is 078°T, 2.6 nm from Gannet Rock daybeacon. You steer 357°T at 4.1 kn through the water. At 0910 a new fix puts you 065°T, 5.4 nm from Tern Island tower.

   Plot the 0910 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  

3. At 1555 your fix is 312°T, 1.6 nm from Kittle water tank. You steer 287°T at 6.1 kn through the water. At 1725 a new fix puts you 035°T, 1.9 nm from Heron Point Light.

   Plot the 1725 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  

4. At 1220 your fix is 324°T, 1.4 nm from Gannet Rock daybeacon. You steer 057°T at 4.0 kn through the water. At 1315 a new fix puts you 030°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1315 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  

5. At 1145 your fix is 061°T, 2.6 nm from Westfield church spire. You steer 072°T at 6.1 kn through the water. At 1240 a new fix puts you 355°T, 1.7 nm from Tern Island tower.

   Plot the 1240 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  

6. At 1235 your fix is 073°T, 2.4 nm from Heron Point Light. You steer 340°T at 5.6 kn through the water. At 1315 a new fix puts you 056°T, 2.0 nm from Westfield church spire.

   Plot the 1315 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 0855 your fix is 358°T, 1.9 nm from Mill stack. You steer 330°T at 4.5 kn through the water. At 1025 a new fix puts you 057°T, 3.6 nm from Westfield church spire.

   Plot the 1025 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  

8. At 0930 your fix is 235°T, 2.8 nm from Tern Island tower. You steer 123°T at 5.3 kn through the water. At 1020 a new fix puts you 217°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1020 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