Worksheet 793 · Skill 5

Set and drift

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1. At 1255 your fix is 047°T, 3.5 nm from Westfield church spire. You steer 128°T at 8.9 kn through the water. At 1330 a new fix puts you 168°T, 1.6 nm from Tern Island tower.

   Plot the 1330 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 0810 your fix is 026°T, 2.9 nm from Gannet Rock daybeacon. You steer 223°T at 4.2 kn through the water. At 0900 a new fix puts you 252°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0900 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  

3. At 1325 your fix is 044°T, 1.5 nm from Tern Island tower. You steer 143°T at 8.7 kn through the water. At 1410 a new fix puts you 018°T, 2.0 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1045 your fix is 020°T, 1.7 nm from Kittle water tank. You steer 010°T at 4.2 kn through the water. At 1145 a new fix puts you 063°T, 2.7 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1255 your fix is 071°T, 2.9 nm from Westfield church spire. You steer 158°T at 4.6 kn through the water. At 1345 a new fix puts you 331°T, 2.3 nm from Mill stack.

   Plot the 1345 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 1155 your fix is 046°T, 2.2 nm from Gannet Rock daybeacon. You steer 335°T at 5.8 kn through the water. At 1235 a new fix puts you 038°T, 2.2 nm from Tern Island tower.

   Plot the 1235 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  

7. At 1210 your fix is 347°T, 1.0 nm from Kittle water tank. You steer 347°T at 7.2 kn through the water. At 1240 a new fix puts you 040°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1240 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 1215 your fix is 297°T, 4.4 nm from Tern Island tower. You steer 173°T at 7.5 kn through the water. At 1255 a new fix puts you 039°T, 2.4 nm from Heron Point Light.

   Plot the 1255 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