Filter Position Data

[st599]

Hi all,

I'm having an issue with the position/SOG data on OpenPlotter.

The AIS transceiver is being used to provide the position data.  It is outputting 2 sentences AIGLL and AIVDO which contain location data and don't always seem to match.  GPS accuaracy is reported as =/- 0.5-1.5m

The issue we're seeing is:

• The position is jumping about as the vessel moves, sometimes moving backwards, sometimes sideways.
  
• When tied to a pontoon the SOG is randomly flickering between 0 and 0.6 knots
  

I'm thinking that it's either an interaction between the 2 sentences or a lack of filtering.

Is there a way to tell the SignalK server to only ever take position data from AIGLL?

Is there a way to add a moving average filter to location, COG and SOG? Something like a 5 second moving average would probably be good.

Simon

[PaddyB]

Down at the bottom of the connections page there's a source priorities input where you can set which position source gets used and a timeout for when to use another