From their FAQ Page:
"What if my smartphone says I’m in a different cemetery when I’m taking
pictures?
If you are in a cemetery, the camera view will list the name of the
cemetery on the side of your screen. If the cemetery name is not the
cemetery you are in, you can change it. Tap the cemetery name, and a
list of possible cemeteries will come up (those in close proximity with
your GPS location). Tap the name of the cemetery you are in. If,
however, your cemetery is not listed or the camera does not recognize
that you are in a cemetery, you can add a cemetery. From the Home
screen, tap Cemeteries, and then either tap the “+” at the top of the
screen or the Add a New Cemetery button at the end of the list of
cemeteries. Save the cemetery you create, and then go back to the camera
view, verify the correct cemetery name is showing, and start taking
pictures.
"What if the map coordinates for the cemetery I added aren’t accurate?
If the coordinates are inaccurate, for whatever reason, please notify us
of the problem and provide the correct latitude and longitude values for
the cemetery (try using Google Maps to get the values).
What if the map coordinates for my photo aren’t accurate?
We are constantly working to improve and update the GPS capabilities of
the BillionGraves app. However, due to varying cell service quality and
other factors, your phone’s GPS is not always 100% accurate. However,
even if a photo has inaccurate coordinates assigned to it, the
coordinates are often close enough to provide anyone searching for a
GPS-tagged headstone with a reasonably narrowed area in which to look.
If you wish to provide a more accurate set of coordinates and can
acquire them through another means, please notify us, referencing the
photo and including accurate latitude and longitude values.
They acknowledge that the technology is inconsistent and sometimes
inaccurate but they do provide a means to correct them.
That being said, I don't use Billion Graves because I can not afford a
smart phone and feel that it is shortsighted of them to exclude all
other means when it would be relatively easy to upload batches of photos
with Cemetery names and co-ordinates with out a smart phone.
--
Gene Young
Researching Young, Harer, Cox & Sallada
With Legacy Family Tree
http://myyoungs.atspace.com/index.htm