Give three advantages to automatic data collectors over field notes.

What is the main objective for leveling?

Give four different methods used for leveling.

$+S$ is also known as

$-S$ is also known as

BM stands for Bench Mark

Name three instruments used for leveling.

For $3^{rd}$ order surveying the FGCS constant is $mm.$

is the amount the final elevati from the starting elevation on a leveling loop.