Sundiallists always know where they are, but do they know where they are going?
This rather rhetorical question is slightly off topic and directed to our computer experts: the question is how does my satellite navigation (Sat Nav) system in my car, or hand held, know where it is going and how to get there when I give it an address? A search in Wikipedia or Google under satellite navigation talks about the satellites, timing, position, etc, but NOT what is in my little box. I assume that the memory holds some form of map (vector storage, or bit map?) and a series of nodes for every single road intersection (and plans thereof). A route finding algorithm must exist for testing all the nodes between and A and B. I also assume each link between any two nodes must obey some rules about speed limits, preferences for motorways, etc. Then, I assume that the incoming signal for latitude and longitude must cause the map to 'place itself' under this lat long so that you can see a real time display of where you are and where you are going. It would be nice to know more! Any advice please. Regards, Doug (who sometimes still get lost) --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
