The Google Maps suggestion is great but it would be nice to be able to access this information more quickly or even have a widget to display it all of the time.
Is there something small and simple to display Latitude, Longitude and Altitude as well as other positional data such as time zone, US zip code, UK postcode, OS grid reference and, for amateur radio enthusiasts, Maidenhead locator?
I'm not sure if Maidenhead Grid Locator
does all of the above or just the locator square but OS Grid Reference Widget
seems to cover quite a few things for UK users.