[CA] Axiom GPS acting up

[Chuck - Raymarine - Moderator]

In fact, the previously referenced FAQ (The boat icon's plotted position is not correct) does indeed address this problem. In short there is either a fault with the MFD's GPS sensor or with the georeferencing of the cartography. As the problem does not appear to be dependent upon the type of cartography which is in use, the problem is looking a bit more like a fault with the installation (i.e. system in need of an external GPS sensor) or a failure of the MFD's internal GPS sensor. The FAQ addresses how to test the performance of a properly installed GPS sensing device (i.e. one which has been installed in a location affording it an unobstructed view of the skies overhead). Systems in which the GPS sensing device (in this case a MFD) has not installed in a location affording it an unobstructed view of the skies overhead may need to be fitted with an external GPS sensor (ex. Raystar 150 GPS Sensor ... the GA150 is not designed to be interfaced to an Axiom MFD). One would typically determine whether an external GPS is required by examining the reported HDOP within the MFD's GPS Status dialog.

Should the GPS sensor be determined to produce a FIX having a HDOP of 1.0 or less, then the problem would be determined to be a georeferencing issue with the cartography on the chart card(s) and the cartography manufacturer(s) would then be contacted to produce corrected cartography. Should the GPS sensor be determined to produce a FIX having a HDOP of 2.0 or greater and the MFD be installed in a location affording it an unobstructed view of the skies overhead, then the problem would be determined to be fault within the MFD's internal GPS receiver, necessitating that the MFD be sent to Raymarine’s Product Repair Center to be bench checked / serviced.