IMAP-package            Interactive Mapping
gdist                   Geodesic distance (great circle distance)
                        between points
imap                    Interactive Mapping
imap.ll                 The Imap plotting function - usually called by
                        imap()
select.pts              Select points; draw polygons; draw lines
world                   GSHHS - A Global Self-consistent, Hierarchical,
                        High-resolution Shoreline Database
