Geograph - photograph every grid square

Not all submissions have EXIF details attached, some image manipulation software strips the EXIF unless you ask it not too. Some contributors deliberately strip the EXIF as an easy fix to portrait images appearing sideways on the site.
Where it exists you can use a browser add-on to view the EXIF or download the photo (not the smallest version when larger ones are available - the next size up will have it). In Windows right-click on the photo in question and select 'Properties' then 'Details'. On macOS, open the photo in Preview, click on 'Tools' up in the menu bar at the top then select 'Show Inspector' and click on the 'Exif' tab. In Irfanview use the 'Image information' button.

This is straightforward: it's simply where the camera was located when the photo was taken. Usually, this is where you were standing. If you used a remote camera, like a drone, you should still provide the drone's location. Many cameras include GPS, so this information might be recorded automatically for you.

That's perfectly fine! Just do your best to locate it on the map. You might need to search for a nearby place name to initially center the map, and then you can refine the location from there.

Most GPS receivers allow you to change the datum and display format to OSGB36 and British National Grid, the convention used by the Ordnance Survey of Great Britain. If you're using a GPS built into a mobile phone, this may not be possible, and your coordinates will always be in WGS84 lat/lon format. If you also use your GPS phone to take your geographs, it should store the positions in the GeoExif header, which Geograph should interpret correctly as camera position (via the Geotagged Image option).

Otherwise, you can use the map part of the submission routine ('locate/find on map') and enter your lat/lon coordinates in the format the 'Search' function, in decimal degrees like 56.45657,-4.54675 . This will look up the grid reference for the location and insert it as _subject_ position into the submission dialogue. You may have to adjust this unless the subject was right in front of you.

Alternatively, there is a conversion tool here on Geograph Tools http://www.nearby.org.uk/coord.cgi?f=conv from which you can copy and paste. Or one built into geograph at https://www.geograph.org.uk/latlong.php

(Question asked by Roga and answered by barryhunter, oasthouse and DHL on the forum http://www.geograph.org.uk/discuss/index.php?&action=vthread&forum=18&topic=13483&dontcount=1&page=0#1
Later updated, as conversion tools have changed over time))

Yes provided they are accurately located and meet the usual criteria.

If the underground space is artificial such as a mine or railway tunnel, they can only be classed as "accepted", i.e. tagged as "inside" or "close look", rather than qualifying as a "Geograph".

If the underground space is natural such as a sea-cave, limestone cave etc., then if there is a large enough space in view a Geograph status is possible, but in a small space it would still be accepted as a "close look".

With the exception of straight tunnels, getting an accurate position underground in the absence of a GPS signal and without a detailed map of a cave system is tricky. In many cases it may be best just to give 4-figure grid reference (i.e. not try to locate the photo within the square).