With GPS, the problem of location and mapping would appear to be solved, but the more I think about it, the more difficult it seems to be. Depending on how accurate you need to be, and how much geographical movement there is in a region, finding where X marks the spot could be very difficult indeed. A place that looks the same from the ground may have moved on the globe because of continental drift, landslides, earthquakes, floods and any number of things. So how can you be sure, when you stand on one spot on the Earth that this is the same spot you stood a year ago? The factor of time plus the habit of matter to decay means any given location measurement really needs to be accompanied by a timestamp and a confidence level.
Mokalus of Borg
PS - And it seems so simple.
PPS - Must have a lot of smarts behind it.