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If the pin is off by quite a bit, such as in the road outside of the cemetery, this is caused by a poor GPS signal.
#1 Locate the pin in question on the volunteer page and click on it.
#2 Click on the names associated with the poor GPS image
From the Life Information Page
#3 Scroll down the page and find Grave Site of ....
#4 Click the pencil icon (right side of the title bar).
#5 Click and hold the gravesite pin .
#6 Move the pin to the correct location; release the mouse button.
#7 Click CANCEL to undo change.
#8 Click SAVE CHANGES to keep change. GPS coordinates are automatically updated.
Step 1 & 2
Step 3 & 4