24-May-2018 -- My final visit to a Degree Confluence Point during this vacation was to this remarkable point in Columbus, Ohio. A few other Degree Confluence Points in the U.S. happen to lie within cities - e.g., in St. Paul, Memphis, and Tulsa - but this one might have the highest population density of them all. As previous visitors had noted, the secret to reaching this point is to get to the service lane that runs between (and parallel to) E. 16^th Avenue and E. 15^th Avenue (the two streets that pass north and south of the point).

The point itself lies just inside one of the buildings in this service lane. By standing next to the building, I was able to get within 6 feet (+/- GPS error of 20 feet) of the point, but couldn’t get ‘all zeros'. The previous visitor - David Combs, in October 2008 - was able to get ‘all zeros’ by standing in the service road, and he wondered why. There are two reasons for this. First, the GPS error in this location is quite high, because of all of the buildings nearby. Second, David Combs had his GPS receiver display coordinates using the “DD MM.MMM” format, which gives you significantly less resolution than the “DD.DDDDD” format (which is the format that everyone should use).