Worksheet 855 · Skill 5

Set and drift

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1. At 0700 your fix is 040°T, 2.2 nm from Tern Island tower. You steer 174°T at 6.6 kn through the water. At 0730 a new fix puts you 001°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 0730 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  

2. At 1145 your fix is 018°T, 1.7 nm from Kittle water tank. You steer 288°T at 6.8 kn through the water. At 1300 a new fix puts you 037°T, 2.2 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1345 your fix is 070°T, 1.9 nm from Gannet Rock daybeacon. You steer 267°T at 8.0 kn through the water. At 1420 a new fix puts you 217°T, 2.8 nm from Tern Island tower.

   Plot the 1420 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  

4. At 1325 your fix is 228°T, 2.1 nm from Tern Island tower. You steer 116°T at 4.8 kn through the water. At 1425 a new fix puts you 331°T, 2.9 nm from Kittle water tank.

   Plot the 1425 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  

5. At 1015 your fix is 083°T, 1.9 nm from Heron Point Light. You steer 339°T at 4.2 kn through the water. At 1140 a new fix puts you 037°T, 4.0 nm from Westfield church spire.

   Plot the 1140 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1450 your fix is 043°T, 2.1 nm from Kittle water tank. You steer 353°T at 7.8 kn through the water. At 1520 a new fix puts you 059°T, 3.7 nm from Gannet Rock daybeacon.

   Plot the 1520 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  

7. At 0905 your fix is 356°T, 1.8 nm from Heron Point Light. You steer 023°T at 8.9 kn through the water. At 0935 a new fix puts you 052°T, 4.0 nm from Westfield church spire.

   Plot the 0935 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  

8. At 1025 your fix is 014°T, 2.4 nm from Mill stack. You steer 286°T at 4.1 kn through the water. At 1115 a new fix puts you 357°T, 1.7 nm from Heron Point Light.

   Plot the 1115 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