Worksheet 87 · Skill 5

Set and drift

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1. At 1410 your fix is 032°T, 3.9 nm from Westfield church spire. You steer 131°T at 6.3 kn through the water. At 1505 a new fix puts you 240°T, 2.1 nm from Tern Island tower.

   Plot the 1505 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  

2. At 0810 your fix is 041°T, 3.2 nm from Heron Point Light. You steer 080°T at 6.6 kn through the water. At 0840 a new fix puts you 172°T, 1.1 nm from Tern Island tower.

   Plot the 0840 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  

3. At 1135 your fix is 058°T, 1.8 nm from Kittle water tank. You steer 344°T at 5.0 kn through the water. At 1245 a new fix puts you 094°T, 2.2 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1025 your fix is 055°T, 3.1 nm from Heron Point Light. You steer 073°T at 8.2 kn through the water. At 1120 a new fix puts you 061°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1120 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 1025 your fix is 204°T, 2.6 nm from Tern Island tower. You steer 266°T at 6.1 kn through the water. At 1115 a new fix puts you 330°T, 3.1 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  

6. At 0845 your fix is 263°T, 2.2 nm from Gannet Rock daybeacon. You steer 112°T at 7.7 kn through the water. At 0925 a new fix puts you 036°T, 1.7 nm from Kittle water tank.

   Plot the 0925 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 1140 your fix is 213°T, 2.8 nm from Tern Island tower. You steer 108°T at 6.8 kn through the water. At 1210 a new fix puts you 164°T, 1.1 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1530 your fix is 231°T, 3.2 nm from Tern Island tower. You steer 253°T at 6.6 kn through the water. At 1600 a new fix puts you 327°T, 1.7 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn