Imports FLEETCODE format data. It produces graphics like those shown below. All fronts and isobars are plotted as spline curves, and due to the limited resolution of the data they may not display optimally. There is no way to alter how a spline plots except to change the scale of the workchart.
To the author's knowledge, FLEETCODE data is produced only for Europe. It comes in under the ASXX21 Family of Services header. One source ready for use is provided in the default Internet tables.