Where are we?

I was reading a news story this morning about some guy beating a speeding ticket because it turned out that the GPS tracking thing in his car showed he was going the speed limit instead of 17 mph faster like the cop's radar claimed. That reminded me of something I've been wanting for a long time. A way to know where I am and what or who is near by. There are lots of variations on the idea already available but not quite available to me. There are GPS systems for cars, planes and boats. I've used lots of nav systems over the years from RF direction finders to VORTAC to Loran to Inertial Nav to VLF to GPS and systems that were used integrations of sensors from several of those technologies. The idea I like best for everday purposes would be a cell phone type technology that could use GPS, cell phone tower locations and built in accelarometry to locate the cell phone on a built in map database that could be customized by connecting to networks and grabbing info like new map layers, updates for the map info and locations of other stuff. I would like to make my location and condition available to "freinds" at all times. I'm kind of a dog type personallity as apposed to a cat type personallity, where cats kind of sneak around about stuff they do, a dog doesn't care who's looking, if a dog can do it everyone can watch and is just as happy if you don't like it as it is if you do. I wish I knew where other people were so we could connect easier when we are close by or when we are doing something the other would like to hook up for etc. etc..... Of course I want it to all be free, open source and I want to do the internets and my email from the same gizmo. But I want a big screen and full size keyboard, lights, camera, action that all folds down to pocket size. I guess that will all have to wait for some new technology. Pocket Holideck that just creates all that in thin air when you need it, anyone?