Worksheet 151 · Skill 5

Set and drift

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1. At 1305 your fix is 282°T, 3.5 nm from Tern Island tower. You steer 144°T at 6.0 kn through the water. At 1410 a new fix puts you 358°T, 1.9 nm from Mill stack.

   Plot the 1410 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  

2. At 1540 your fix is 237°T, 2.0 nm from Tern Island tower. You steer 255°T at 7.9 kn through the water. At 1610 a new fix puts you 015°T, 2.7 nm from Heron Point Light.

   Plot the 1610 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 1540 your fix is 049°T, 2.4 nm from Heron Point Light. You steer 074°T at 5.1 kn through the water. At 1655 a new fix puts you 158°T, 2.7 nm from Tern Island tower.

   Plot the 1655 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  

4. At 0825 your fix is 069°T, 2.6 nm from Westfield church spire. You steer 056°T at 4.0 kn through the water. At 0855 a new fix puts you 292°T, 4.1 nm from Tern Island tower.

   Plot the 0855 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  

5. At 1120 your fix is 031°T, 1.7 nm from Westfield church spire. You steer 122°T at 4.4 kn through the water. At 1220 a new fix puts you 245°T, 3.0 nm from Tern Island tower.

   Plot the 1220 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  

6. At 1030 your fix is 250°T, 3.0 nm from Tern Island tower. You steer 161°T at 7.1 kn through the water. At 1100 a new fix puts you 017°T, 1.1 nm from Mill stack.

   Plot the 1100 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 1050 your fix is 110°T, 2.2 nm from Gannet Rock daybeacon. You steer 333°T at 4.5 kn through the water. At 1150 a new fix puts you 025°T, 2.8 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1115 your fix is 221°T, 2.1 nm from Tern Island tower. You steer 328°T at 5.1 kn through the water. At 1155 a new fix puts you 298°T, 3.8 nm from Tern Island tower.

   Plot the 1155 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