Worksheet 220 · Skill 5

Set and drift

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1. At 1120 your fix is 047°T, 3.2 nm from Westfield church spire. You steer 081°T at 6.0 kn through the water. At 1200 a new fix puts you 304°T, 1.4 nm from Tern Island tower.

   Plot the 1200 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  

2. At 1305 your fix is 050°T, 2.4 nm from Tern Island tower. You steer 175°T at 4.0 kn through the water. At 1400 a new fix puts you 069°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1400 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  

3. At 1110 your fix is 292°T, 1.4 nm from Tern Island tower. You steer 218°T at 7.8 kn through the water. At 1150 a new fix puts you 028°T, 1.5 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1325 your fix is 297°T, 1.6 nm from Tern Island tower. You steer 191°T at 4.6 kn through the water. At 1425 a new fix puts you 216°T, 2.4 nm from Tern Island tower.

   Plot the 1425 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 1115 your fix is 137°T, 1.0 nm from Gannet Rock daybeacon. You steer 280°T at 7.6 kn through the water. At 1150 a new fix puts you 062°T, 3.0 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1415 your fix is 061°T, 2.5 nm from Heron Point Light. You steer 019°T at 8.0 kn through the water. At 1450 a new fix puts you 312°T, 1.7 nm from Tern Island tower.

   Plot the 1450 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 1355 your fix is 004°T, 1.6 nm from Mill stack. You steer 024°T at 5.4 kn through the water. At 1430 a new fix puts you 209°T, 1.9 nm from Tern Island tower.

   Plot the 1430 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  

8. At 1335 your fix is 176°T, 1.2 nm from Tern Island tower. You steer 155°T at 5.7 kn through the water. At 1410 a new fix puts you 322°T, 1.4 nm from Kittle water tank.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn