Your system sounds great.
I wonder how it might work combining it with a Furuno
GP33 GPS, which is connected into a NMEA 2000
network with Triton displays.
Besides NMEA 2000 the GP33 has a separate connection on the back for NMEA 0183
data, it can read/write both. Suppose you could do your planning, waypoint and route creation on your laptop/tablet using Open CPN
, then via your little gizmo, transfer the route/waypoints to the GP33. The GP33 is then responsible to maintain a constant vessel position and range/bearing to the next waypoint. This means the laptop/tablet can be shut down between waypoints to save power, while the GP33 at 330 milliamps takes care of the navigation between waypoints.
The only potential problem I see is that the GP33 instructions say if you upload data it overwrites what is already on the system. In that case I suppose you'd have to have a folder on the laptop containing all routes/waypoints which you'd add to each time, then transfer the lot each time.