Worksheet 633 · Skill 5

Set and drift

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1. At 0940 your fix is 055°T, 2.4 nm from Westfield church spire. You steer 111°T at 7.1 kn through the water. At 1015 a new fix puts you 216°T, 2.1 nm from Tern Island tower.

   Plot the 1015 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  

2. At 0835 your fix is 268°T, 2.0 nm from Tern Island tower. You steer 192°T at 7.1 kn through the water. At 0920 a new fix puts you 357°T, 1.6 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1550 your fix is 287°T, 3.4 nm from Tern Island tower. You steer 290°T at 7.4 kn through the water. At 1620 a new fix puts you 006°T, 2.9 nm from Westfield church spire.

   Plot the 1620 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 0930 your fix is 358°T, 2.4 nm from Tern Island tower. You steer 132°T at 6.6 kn through the water. At 1030 a new fix puts you 101°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1030 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 1505 your fix is 145°T, 1.9 nm from Westfield church spire. You steer 104°T at 4.0 kn through the water. At 1630 a new fix puts you 288°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1630 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 1210 your fix is 075°T, 2.4 nm from Gannet Rock daybeacon. You steer 268°T at 8.5 kn through the water. At 1300 a new fix puts you 234°T, 2.6 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1025 your fix is 260°T, 1.9 nm from Tern Island tower. You steer 293°T at 4.3 kn through the water. At 1105 a new fix puts you 296°T, 4.2 nm from Tern Island tower.

   Plot the 1105 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  

8. At 1220 your fix is 028°T, 2.3 nm from Heron Point Light. You steer 331°T at 5.0 kn through the water. At 1310 a new fix puts you 053°T, 3.4 nm from Westfield church spire.

   Plot the 1310 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