Windows-based plotting software designed for commercial use. Will interface with navigation instruments. Can display either vectored or raster scanned charts.
Unmoderated forum on marine electrical and electronic equipment. Good advice and resources here, but you have to dig and you have to be selective.
An excellent description of the various NMEA, SeaTalk, HSB, Xanbus, Garmin, and TackTick networks for communication among navigational and other electronics on board. 8 pages with diagrams.
For those who do not want to rely entirely on electronics, an unusual low-cost combination of electronics and paper charts, with a separate or built-in GPS depending on the model, lets you do many plotting functions using a mouse-like device.
Line of programmable chart plotting systems with brilliant daylight screens. One system works directly with your computer monitor.