1.7. GPS devices. What are they useful for?
A GPS navigation device (Global Positioning System) is a device that receives information from several satellites and accurately...
1.4. Map projections.
What an orange hides! The Earth is an almost perfect sphere but if we want to represent it in a flat surface to study some places in...
1.3. Where does Burt Simpson live?
Hi everybody. I am Virginia and I live in Valencia. I suppose that most of you, if not all, live in Valencia as well. But, where do we...
1.2. Where are we?
When we want to know the exact location of a place on the Earth, we need its latitude and longitude. Latitude is the distance between a...
