Use a phone that has a Global Positioning System receiver built into it and the possibilities seem limitless.

The watch, which has a rechargeable battery, contains a miniature Global Positioning System receiver.

The computer is connected to a Global Positioning System receiver carried on the user's back, which keeps track of the latitude and longitude.

And, at the cost of being a bit bulkier than an ordinary wristwatch, the M9 includes a Global Positioning System receiver.

I use a Global Positioning System satellite receiver to locate sites of interest.

Two companies now sell Global Positioning System receivers for use in their cars.

GPSgames.org is an online community dedicated to all kinds of games involving Global Positioning System receivers.

Mr. Kimmelman did the same thing with a Global Positioning System receiver he bought a couple of years ago.

There are, of course, already electronic gadgets that can tell their owners where they are - most obviously, Global Positioning System receivers.

If you have a pocket or laptop computer, you can also get add-on Global Positioning System receivers and mapping software.