What are three types of tools used by geographers to understand our world

They use a number of tools to navigate the earth.

Explanation:

The tools used by these geographers are hemispheres. There is a hemisphere based on the equator and prime meridian. For example the United States mainland is in the northern and western hemispheres.

maps, GPS & GIS

Explanation:

maps - drawings of the earth

GPS - Global Positionin System (which uses satellites to locate latitude & longitude)

GIS - Geographic Information system, which is a database that collects & analyzes spatial or geographical data.