There is a lot of equipment used. The number of people and a lot of time to make a survey of the area is less than the VES. Need a space to explore and survey equipment is expensive.
The downside is that there are many devices. The number of people and a lot of time to make a survey of the area less than a VES. Require a lot of space to explore and survey equipment is expensive.
The downside is that equipment is used. The number of people and time to explore the area less than a VES. Need space survey and surveying equipment is expensive.