Our navigation rests upon an old refurbished Standard Horizon chartplotter, and Navionics (installed onto all of our mobile devices). Navionics's depth maps, compass, GPS, waypoints, community edits, and more, are all the features that we could ever wish for to get from A to B, over water. We use it along with a separate AIS tool for traffic. Navionics lists positions in degrees minutes seconds, or DMS for short.
The chartplotter was a donation from our friends on SY Dakota (they upgrade d theirs and gave us their old one). For now, it carries all of the maps for western canada.
We carry a sextant aboard, and both of us are learning to use it. Depending on GPS isn't ideal, and learning to navigate without it might save your life.