[CA] [CA11] Speed bouncing

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum ddfour1,

MFDs running LightHouse 3 software are capable of reporting two different types of speed data ... speed over ground (SOG) and speed through water (STW). If the reported issue concerns SOG, then it may be indicative of more than one source of GPS data within the system and/or insufficient GPS signal strength being sensed by system's source of GPS data. For maximum performance, it is recommended that the GPS data source for the system be installed in a location affording it an unobstructed view of the skies overhead. Have you used the MFD's Data Sources feature specify which data source will be used for GPS? If so, which device was designated as the system's GPS data source? Has it been installed in a location affording it an unobstructed view of the skies overhead?