Fuel burn numbers - Command Link vs Raymarine C120W

[john-d]

**** SOLVED ****
The C120W is set to use IMPERIAL GALLONS instead of US gallons as the fluid measure by default (thanks User Manual!). So the problem below is that the C120w is displaying imp gals/hr instead of us gal/hr. There is a "units" menu in the system setup menu that lets you select the correct fluid measure.
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Just recently added a connection from my Yamaha Command Link square gauges to my Raymarine C120W via seatalk ng. All the engine data, when displayed on the C120W, displays accurately, except for the GPH figure. See attached pictures - where the command link gauge says 15.7, c120w says 13.29. This difference stays proportional throughout the rpm range.

Has anyone experienced this before? I'm 99% positive that the yamaha gauge is the correct one, as the fuel TTL is always spot-on on fillups. Any ideas?

thanks.

[jethro1]

Most fuel management meters let you input a correction factor. For example, the Yam fuel gauge can be calibrated plur or minus 7% in case the fuel flow displayed does not match the actual fuel consumption. Check your Raymarine manual to see if it lets you make a correction.

[john-d]

added solution to my original post - should have remembered that raymarine is a UK company