Jim: If you can use a hard wired unit, the Garmin GPSMAP 420 and 520, (4" and 5" screens), plotters have the capability of using the BlueChart g2 Vision SD card which will give you "auto guidance" and 3D map view features. They also support DSC communication with a capable VHF radio. Just my 2 cents, Bill Larson M17 #632 jim sadler <jimsadler@jascopacific.com> wrote: Ahoy Skippers This weekend we rounded the W. end of Catalina (on my cousins Catalina 310) at midnight a sailed into Catalina harbor. My old GPS gave me fixes which I plotted onto a chart to see our track and make sure we were not going aground. There was no visibility and I found myself hallucinating in the night and spending way too much time plotting our track. I decided if we make it through this and I could get back to the form I would ask you skippers if you are using GPS systems with plotting capabilities? What are the hot systems? Capt,n James A Sadler skipper sailing vessel Pelican M15 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats