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.