Question

Which of the following is a horizontal datum?

• A. Mean Sea Level (MSL)
• B. EGM96
• C. WGS84
• D. NAV88

Hint:

Remember: \[ \boxed{ \begin{aligned} \text{WGS84} &\rightarrow \text{Horizontal Datum} \text{MSL / EGM96 / NAVD88} &\rightarrow \text{Vertical Datum} \end{aligned} } \]

Answer 1

The Correct Option is C

Concept: A horizontal datum defines the reference framework used for locating positions on the Earth's surface. WGS84 (World Geodetic System 1984) is the standard global horizontal datum used by GPS.

Step 1: Differentiate horizontal and vertical datums.
• WGS84 $\rightarrow$ Horizontal datum.
• Mean Sea Level (MSL), EGM96, NAVD88 $\rightarrow$ Vertical datums/geoid models.

Step 2: Choose the horizontal datum. Thus, \[ \boxed{\text{WGS84 is a horizontal datum}.} \] Therefore, the correct option is \[ \boxed{(C).} \]