Some time ago I wondered about something like a flip-over desktop\ncalendar to show a letter or number so I could place it within a\nphotograph to identify a location etc. I never found anything suitable\nso printed some A4 cards with a single large letter then laminated them.\nI have used these when photographing a group of old structures, I was\nable to include an identifying letter as used on a plan available of the\nsite.\n\nI got thinking about doing something similar with my Android tablet\ncomputer. There seem to be plenty of 'clapperboard' Apps around for use\nwhen filming but I wonder if there are simpler ones for stills. I was\nthink that it could be useful to have a incremented number and / or\nletters, spare for some text and perhaps display time, Lat / Long and\nperhaps compass. Some of this can be done crudely with a simple Notepad\napplication but wonder if anyone has tried anything more flexible.