Free Maps ~upd~ — Navionics

This is where many boaters get confused. If you buy a Lowrance, Simrad, or B&G unit, it often comes with a "Navionics+" card included.

Navionics chart viewer's free alternative - blog - Anchorages navionics free maps

This is the marine equivalent of Wikipedia. It is a free, crowdsourced map that runs on many software platforms (and can be viewed on computers/smartphones). This is where many boaters get confused

"Navionics free maps" exist, but they exist on a spectrum. or B&G unit