Fortran functions?

Ok, I have an oddball question.  But let me give you a little background.

As a broadcast engineer, I often need to compute the distance to a groundwave
contour for an AM radio station.  The code to do this is in Fortran 77, which
compiles cleanly with g77 (after I made some minor modifications, since the
original was VAX/VMS Fortran).  Since the results of the calculations are
used for FCC regulatory purposes, it is recommended to use the FCC's actual
code (which is what I have), in Fortran, to perform the calculations.
Otherwise they may not accept my filings, which is expensive (it costs $$$ to
file applications with the FCC).

Has anyone here successfully used Fortran functions in PostgreSQL using g77 as
the compiler?
--
Lamar Owen
WGCR Internet Radio
1 Peter 4:11