10.6. Horizontal and Vertical Control

Try these first

1. 1.

   What is horizontal control?

   Hint

   Think about X and Y coordinates.

2. 2.

   Name one common vertical datum.

   Hint

   What average level of the ocean do we use as a reference?

3. 3.

   What does horizontal control ensure in hydrographic surveying?

   • A. Accuracy of depth measurements
   • B. Positional accuracy of surveyed area
   • C. Reliable tidal measurements

   Hint

   Think about what mapping requires.

4. 4.

   Is Mean Sea Level (MSL) a common reference for depth measurements in hydrographic surveys?

   • True
   • False

   Hint

   Consider its role in navigation.

5. 5.

   Evaluate how using an incorrect datum can lead to a 5% error margin in a coastal construction project.

   Hint

   Look at how crucial accurate water depth is for construction.

6. 6.

   Given a position fix error of 3 meters in horizontal control, what implications might this have on navigation near a coastline?

   Hint

   Consider the realities of close navigation near hazards.