Thanks for the explanation. Helpful as always.
I was misled by a thread on Cruisers Forum that MFDs set the calibration in the sensors, rather than applying the correction in the MFD to the data received from the sensors. Clearly it is better to have the sensors transmitting corrected data, assuring that all displays on N2K show the same numbers, but I am only aware of one display (RM ST70+) that supports programming sensors. I hope this feature will be included in future Furuno software.
I have learned that Airmar's Weathercaster software, through an Actisense USB-N2K adapter, is able to program the calibration in the Airmar sensors. Since I already have the Actisense bridge I will go that way.