We would have something purpose made from raymarine/garmin/whoever hard-mounted to the steering station networked into the various sensors onboard. There would be at least one redundant display elsewhere (out of the weather in the case of boats steered from deck). We would never go for something on a raspi. Some boats will have the sensor canbus hooked into a computer to use additional software. The purpose made displays are all sleek touchscreen systems that look more like a Tesla interface than this raspi thing.
As far as UI and graphics: They are modeled on what actual paper charts look like (which is standardized, and what mariners are trained to use). These are systems designed as a safety tool first, and iterating through the latest design fads every 2-3 years to make things pretty is unsafe. I want my chart-plotters and tools to be near universal in symbology and interface, and that is what they have done.