Use an external software
such as gippy
(linux) or polarcom
(windows mac linux) for gps and nmea
display. Gippy may well become an integral/modular part of opencpn at some stage.
By the way, course speed and wp distance are all displayed, just play around with it a bit or consult the extensive manual wiki
You can display grib files within opencpn, if you are however receiving weather
faxes you will have to view them with the appropriate software. I doubt you will find a chartplotter that can display those.
USB to serial
adaptors have been reported to work although there can be driver issues in linux
. Do check for compatibility if you intend to use it with linux
. On windows this should be a simple driver install.
If you are aware of any specific reliability
problems with ais and opencpn, please state where you found this information and/or get the source to report it as a bug; there's no point hearsaying this around. The core
dev team (Dave or bdboat on this forum) are (is) extremely responsive in resolving bugs. I am not aware of any ais issues at this time.