[CA] [CA11] Axiom Pro speed jumps erratically

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Kevin,

The reported symptom may be caused by the effects of sea state on the vessel (i.e. slowing and then speeding up again) or may be indicative insufficient GPS signal strength being received by the system's GPS source. Under flat sea conditions, one may expect that SOG should be reasonably stable. However, as seas build, it would be normal to expect such rapid changes in SOG. With regard to ensuring that the system's GPS receiver, the device which is serving as the system's GPS receiver must have an unobstructed view of the skies overhead. If not, then the addition of an external GPS receiver (ex. Raystar 150 GPS Sensor, etc.) to the system should be considered.