GIS is a form of digital mapping technology. Kind of like Google Earth, but better.
Some mapping projects will require a licensed surveyor. UpAngle provides imagery data that is only survey accurate if validated by a licensed surveyor.
It's impossible to map out a route to your destination if you don't know where you're starting from.
Measure twice, Cut once.
The prices of raw materials do not fluctuate directly with the labour cost of producing them.
Be a yardstick of quality. Some people aren't used to an environment where excellence is expected.