[CA] [CA11] Axiom, Axiom Pro Fuel Management

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Mike,

The LightHouse II / 3 engineering specification for the Fuel Manager feature calls for fuel economy calculation based upon GPS SOG, not speed through water. The MFD will calculate the Fuel Economy data item when the Fuel Manager has been configure to ON and the Fuel Flow Rate (PGN 127489) setting (within the Fuel Manager setup dialog) has been selected. When the Fuel Used (PGN 127497) setting has been selected, the Fuel Economy data item reported by the MFD will simply be data repeated from fuel economy data included within PGN 127497.

The LightHouse II / 3 software accordingly provides no option to use any speed source as an alternative to GPS SOG for fuel economy and estimated fuel range calculations determined by the Fuel Manager feature (i.e. PGN 127489 selected). By using SOG, the calculations for fuel efficiency and estimated fuel range take into account the effects of leeway in increasing or decreasing the reported fuel efficiency (ex. if leeway forces (wind and/or current) are in the direction opposite the vessel's motion, then fuel efficiency and estimated fuel range will be less than they would be if leeway forces are in the same direction as the vessel's motion).