Worksheet 592 · Skill 5

Set and drift

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1. At 0700 your fix is 054°T, 1.5 nm from Westfield church spire. You steer 073°T at 5.6 kn through the water. At 0750 a new fix puts you 316°T, 3.2 nm from Tern Island tower.

   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 1340 your fix is 024°T, 1.0 nm from Kittle water tank. You steer 301°T at 6.3 kn through the water. At 1445 a new fix puts you 238°T, 3.2 nm from Tern Island tower.

   Plot the 1445 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  

3. At 1255 your fix is 059°T, 1.2 nm from Heron Point Light. You steer 023°T at 6.5 kn through the water. At 1325 a new fix puts you 088°T, 3.3 nm from Westfield church spire.

   Plot the 1325 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 0945 your fix is 057°T, 2.9 nm from Heron Point Light. You steer 004°T at 6.2 kn through the water. At 1025 a new fix puts you 298°T, 2.4 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0845 your fix is 326°T, 2.0 nm from Tern Island tower. You steer 235°T at 7.0 kn through the water. At 0930 a new fix puts you 091°T, 2.8 nm from Westfield church spire.

   Plot the 0930 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  

6. At 1055 your fix is 252°T, 2.0 nm from Gannet Rock daybeacon. You steer 336°T at 4.6 kn through the water. At 1130 a new fix puts you 245°T, 2.6 nm from Tern Island tower.

   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  

7. At 1100 your fix is 054°T, 3.4 nm from Heron Point Light. You steer 015°T at 4.4 kn through the water. At 1150 a new fix puts you 331°T, 1.8 nm from Tern Island tower.

   Plot the 1150 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 1105 your fix is 107°T, 2.2 nm from Gannet Rock daybeacon. You steer 000°T at 4.2 kn through the water. At 1225 a new fix puts you 051°T, 2.7 nm from Tern Island tower.

   Plot the 1225 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn