[CA] [CA11] Axiom Pro speed jumps erratically

[Chuck - Raymarine - Moderator]

All,

Chartplotting / MFD products featuring internal GPS receivers differ in their sensitivity, not only due to the quality of the GPS receiver/antenna assemblies used, but also in the RF interference effects of additional circuity (ex. fishfinder, video processing, etc.) housed within the the product. Accordingly, satisfactory GPS reception of a prior Chartplotter / MFD in an installation location is no guarantee of another Chartplotting / MFD design in that same location. While a hard top would qualify as an obstruction to GPS signal, a fabric bimini would not typically be considered an obstruction. That said, should the chartplotting product / MFD be the system's GPS data source and be installed in a location affording it an unobstructed view of the skies overhead and be unable to acquire a GPS position FIX, intermittently lose GPS FIX, or produce an inaccurate GPS position FIX (typically accompanied by high HDOP ... which is normally 1.0 or less, then it would be recommended that the chartplotting product / MFD be sent to Raymarine’s Product Repair Center to be bench checked / serviced. Similarly, should and external GPS sensor (ex. Raystar 150, Raystar 130, etc.) be the system's GPS data source and be installed in a location affording it an unobstructed view of the skies overhead and be unable to acquire a GPS position FIX, intermittently lose GPS FIX, or produce an inaccurate GPS position FIX (typically accompanied by high HDOP ... which is normally 1.0 or less, then it would be recommended that the GPS sensor be sent to Raymarine’s Product Repair Center to be bench checked / serviced.

The symptom shown within the John's video (I believe that this may also be what Kevin is also reporting) is fairly typical and may be improved by increasing the COG/SOG Filter configuration setting. The default value of this setting is MEDIUM, and it would be recommended that it be increased to HIGH.