Start by running "make depend" This is a double precision version of the map projections done in gridpak. These are in C++ and work (today) with g++. In both cases, edit the .cc file and provide it with the map projection parameters, then compile. Coast: provide it with strings of lat,lon pairs, ending in a special value of 999, 999. See coast.in for example. Tolat2: give the grid filename as an argument or it will prompt for it. It will perform the inverse map projections to find the latitude, longitude values on your gridpoints.