[boost] geodetic library

is there a need for subj? i implemented very accurate direct and inverse geodetic problem routines (as well as geocentric (X, Y, Z) to geodetic (B, L, H) conversion) i used bessel's method to derive the formulas 6 iterations for both direct and inverse routines is enough to converge to full double precision (16 digits) however the formulas themselves provide 9 significant digits that is 1cm accuracy regardless of range (i.e. range = 1m..20000km) to get acceptable accuracy, say, 2 iterations is enough (or even 1) however there are several other aspects uncovered (area and perimeter, projections, etc.) -- Pavel