Getting Route details into SignalK

[affinite]

Just occurred to me that if I am sending the route details to SignalK, am I creating a loop whereby SignalK is sending this back to Opencpn?  Is this handled automatically or do I need to apply a filter to the SignalK data coming to Opencpn to stop the data going round in circles??

Yes

You need to configure your Network Input Connection in OpenCPN to IGNORE the RMB sentence or, as you say, when you activate a route or waypoint in OCPN you will have a loop which will grind your RPi to a standstill.
Dont ask me how I know this !