45'72'W 38'50'N
The goofs section correctly notes that the long/lat point given for Beatrice's place of rescue is not anywhere near the north Atlantic great circle route.
Google Maps gives the location as 72W. 50th Ave, Great Bend, Kansas. This otherwise uninteresting point is notable mainly for being somewhere around the geodetic (adjusted for curvature of the earth) center of the continental United States. It is about 40 or 50 miles south of the more commonly given geographic center of the US in Lebanon, KS.
Given that we know that Hartley pays attention to small details, can anyone guess what on earth the point of this apparently deliberate geography error is?