I have been using Opencpn
on a computer connected to my Raymarine
through a usb to RS422 converter for some time now fairly successfully. However the CM93 charts
I am using lack detail for many of the rivers and inland channels I often frequent.
I also have Navionics
on a Sony tablet, which I bought mainly because it has an internal GPS
and is water
resistant. The Navionics charts
on the tablet have a great deal more depth
detail on them than the CM93 charts and I have found them to be fairly accurate.
As a technique to transit places I regularly frequent I have taken to plotting routes on the computer then doing the navigating in the cockpit
using the tablet for best water
. I later move waypoints in the Opencpn route
where it diverges from the actual. Seems to be working well.
I would like to be able to run the autopilot
using the tablet but the version of Navionics I have appears to lack the functionality to do so, I have yet to find an economical wifi
to RS422 converter and I have found the touch screen
on the tablet unreliable when spray or rain wets it.