Worksheet 59 · Skill 5

Set and drift

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1. At 1250 your fix is 043°T, 3.5 nm from Westfield church spire. You steer 176°T at 6.7 kn through the water. At 1335 a new fix puts you 057°T, 1.4 nm from Heron Point Light.

   Plot the 1335 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  

2. At 1345 your fix is 094°T, 3.4 nm from Westfield church spire. You steer 111°T at 4.6 kn through the water. At 1510 a new fix puts you 226°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1510 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 1355 your fix is 031°T, 2.7 nm from Kittle water tank. You steer 351°T at 4.0 kn through the water. At 1505 a new fix puts you 079°T, 3.4 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1405 your fix is 073°T, 2.8 nm from Tern Island tower. You steer 163°T at 8.5 kn through the water. At 1445 a new fix puts you 103°T, 2.4 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1550 your fix is 257°T, 2.2 nm from Tern Island tower. You steer 249°T at 6.6 kn through the water. At 1630 a new fix puts you 328°T, 1.4 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0810 your fix is 090°T, 3.7 nm from Westfield church spire. You steer 062°T at 4.7 kn through the water. At 0840 a new fix puts you 263°T, 2.8 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  

7. At 1140 your fix is 270°T, 2.5 nm from Gannet Rock daybeacon. You steer 066°T at 8.3 kn through the water. At 1220 a new fix puts you 064°T, 2.4 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1110 your fix is 070°T, 0.9 nm from Gannet Rock daybeacon. You steer 359°T at 6.2 kn through the water. At 1145 a new fix puts you 066°T, 2.6 nm from Tern Island tower.

   Plot the 1145 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