Worksheet 341 · Skill 5

Set and drift

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1. At 1215 your fix is 208°T, 0.9 nm from Gannet Rock daybeacon. You steer 108°T at 5.5 kn through the water. At 1245 a new fix puts you 013°T, 1.9 nm from Kittle water tank.

   Plot the 1245 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 0755 your fix is 006°T, 1.3 nm from Heron Point Light. You steer 107°T at 4.0 kn through the water. At 0920 a new fix puts you 001°T, 3.2 nm from Mill stack.

   Plot the 0920 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  

3. At 1105 your fix is 035°T, 3.4 nm from Gannet Rock daybeacon. You steer 291°T at 5.2 kn through the water. At 1210 a new fix puts you 347°T, 2.4 nm from Tern Island tower.

   Plot the 1210 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 1055 your fix is 046°T, 2.0 nm from Heron Point Light. You steer 331°T at 5.9 kn through the water. At 1130 a new fix puts you 046°T, 2.4 nm from Westfield church spire.

   Plot the 1130 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 049°T, 2.9 nm from Westfield church spire. You steer 071°T at 4.8 kn through the water. At 1455 a new fix puts you 288°T, 2.7 nm from Tern Island tower.

   Plot the 1455 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  

6. At 1515 your fix is 040°T, 3.8 nm from Gannet Rock daybeacon. You steer 230°T at 5.5 kn through the water. At 1615 a new fix puts you 024°T, 1.7 nm from Mill stack.

   Plot the 1615 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  

7. At 1510 your fix is 043°T, 3.0 nm from Heron Point Light. You steer 119°T at 5.0 kn through the water. At 1600 a new fix puts you 287°T, 2.4 nm from Kittle water tank.

   Plot the 1600 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 1040 your fix is 047°T, 3.9 nm from Westfield church spire. You steer 154°T at 6.4 kn through the water. At 1130 a new fix puts you 254°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1130 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