Disclaimer - I have never taken a GIS course, but I have designed part of an antenna for a GPS satellite...
My definition of GIS - the As-built or the site conditions maps. They are a combination of GPS (usually) data compiled and presented in a easily readable form.
If you had a site plan with wetlands, vegetation, easements and resourses delineated it would help to understand how the data got there.
It is even more helpful to integrate that data into a mobile GPS unit when walking the site.
I created a routing plan of the course (GIS) and mapped it to my hand held (GPS) and staked the course and still do so.
.... To Be continued...