Garmin Bluechart G3 on GPSMAP 64s/65s

I was wondering if anybody was using Bluechart maps on a handheld like the 64s or 65s or similar?
If so, what info does it display? Is it worth it over plotting on a laptop/tablet/phone then exporting as a GPX?

I'm a little confused by the marine settings already so any info would be great help.

Garmin GPSMAP 64s - Bluechart G3