garmin chartplotters- what charts included?
I have a friend looking for an inexpensive chartplotter. I have a Garmin GPS Map 172c. That came with no built-in charts, and you purchase (unlock) whatever charts you want from a CD and load them into the unit.
I'm looking at the lower-priced Garmins- the 420, 421, etc. They say they come with preloaded "worldwide" basemaps, but what does this mean? Will they have detailed Great Lakes charts built-in, or must these be purchased separately? I have studied the Garmin site and vendors sites, but just can't tell.