As suggested here (which we have successfully used in past), the Survey123 GeoPoint field allows manual entry via clicking the map, then clicking the lat/long values at bottom, then entering correct lat/long values, then clicking the checkbox at right.
We followed this procedure, however, last week in a teacher institute (using latest Survey123 for iOS, v2.3.29?), and the manual values we entered were not saved, i.e., when the record was submitted the manually entered lat/long was replaced by a value on the map—sometimes a wildly inaccurate value.
I am trying to determine whether (a) this manual geopoint procedure still works, and (b) what the workflow should be to make sure it works correctly. We typically do these surveys with K-12 students, and some of our data locations are known with relatively high accuracy we wish to maintain, thus we'd like to make it work again via some relatively straightforward method.