Worksheet 173 · Skill 5

Set and drift

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1. At 1235 your fix is 274°T, 2.7 nm from Tern Island tower. You steer 135°T at 5.4 kn through the water. At 1320 a new fix puts you 193°T, 2.3 nm from Tern Island tower.

   Plot the 1320 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 1235 your fix is 174°T, 1.0 nm from Westfield church spire. You steer 098°T at 5.8 kn through the water. At 1310 a new fix puts you 032°T, 2.1 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1135 your fix is 229°T, 2.0 nm from Gannet Rock daybeacon. You steer 082°T at 7.6 kn through the water. At 1210 a new fix puts you 115°T, 1.7 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1215 your fix is 079°T, 2.0 nm from Heron Point Light. You steer 076°T at 6.2 kn through the water. At 1250 a new fix puts you 264°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1250 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  

5. At 1440 your fix is 020°T, 2.7 nm from Westfield church spire. You steer 170°T at 7.6 kn through the water. At 1520 a new fix puts you 052°T, 1.2 nm from Heron Point Light.

   Plot the 1520 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 1450 your fix is 065°T, 3.8 nm from Westfield church spire. You steer 201°T at 6.5 kn through the water. At 1525 a new fix puts you 147°T, 1.9 nm from Westfield church spire.

   Plot the 1525 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 0925 your fix is 050°T, 2.9 nm from Tern Island tower. You steer 156°T at 4.5 kn through the water. At 0955 a new fix puts you 036°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 0955 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 0700 your fix is 062°T, 2.7 nm from Heron Point Light. You steer 089°T at 7.8 kn through the water. At 0745 a new fix puts you 147°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0745 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