Worksheet 674 · Skill 5

Set and drift

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1. At 0940 your fix is 002°T, 1.0 nm from Gannet Rock daybeacon. You steer 260°T at 6.3 kn through the water. At 1030 a new fix puts you 052°T, 3.3 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1230 your fix is 339°T, 2.5 nm from Tern Island tower. You steer 221°T at 4.2 kn through the water. At 1310 a new fix puts you 266°T, 2.8 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1155 your fix is 027°T, 2.5 nm from Kittle water tank. You steer 258°T at 6.4 kn through the water. At 1250 a new fix puts you 344°T, 2.2 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1410 your fix is 226°T, 1.4 nm from Tern Island tower. You steer 316°T at 5.1 kn through the water. At 1505 a new fix puts you 049°T, 3.9 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1140 your fix is 305°T, 1.7 nm from Kittle water tank. You steer 321°T at 5.5 kn through the water. At 1230 a new fix puts you 253°T, 2.4 nm from Tern Island tower.

   Plot the 1230 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  

6. At 1425 your fix is 351°T, 2.0 nm from Heron Point Light. You steer 351°T at 5.1 kn through the water. At 1510 a new fix puts you 032°T, 3.6 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1400 your fix is 054°T, 1.8 nm from Heron Point Light. You steer 089°T at 8.7 kn through the water. At 1455 a new fix puts you 035°T, 3.0 nm from Kittle water tank.

   Plot the 1455 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  

8. At 0840 your fix is 072°T, 2.3 nm from Heron Point Light. You steer 327°T at 5.9 kn through the water. At 0920 a new fix puts you 082°T, 2.1 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn