That was from the "SmartPilot Series: S1 Wheelpilot, S1 TillerPilot Operating guide, Document Reference 81283-1", as downloaded from the Raymarine web site.
It's section 2.5, User Calibration options, under User Calibration Pages. It's 2nd entry, right after AutoTack Angle and before Wind Selection (app vs true). Page 31 in this version of the guide.
This is most likely specific to the model and firmware version. My actual menus do not quite match the manual. I haven't confirmed the entry on the actual device. I will check at my first opportunity.
s/v Dancing Days
Lewisville Lake, TX