As I’ve thought about it more, I think what I’d really prefer is to :
a) have the displayed obscuring rectangle enlarged if the user-entered accuracy is large
b) have the Identify Modal and Obs details both use the same user-entered accuracy value (and both in the same units please)
c) add a separate field to the obs details for the size of the obscuring rectangle (only for obscured obs)
The reason I would move the size of the obscuring rectangle to a new field is that the rectangle itself already gives you a visual indication of its size. The user-entered value is useful to me because I’m more likely to want to interact with an observer who entered a small value that was obscured up than with an observer who entered a large value. So I don’t need the numeric size of the rectangle easily accessible, but it would be useful to know if the user-entered value is smaller than the visual indicator.