Cura Z offset question

Question: If I set the Z offset in Cura Machine -> Machine Settings, am I overriding the setting in the firmware (as set by the M851 command) or am I just adjusting that number.

For example, if my z-offset is reported as -1.32 when I use the M851 command, will entering 0.1 for z-offset in Machine Settings give me a an effective z-offset of -1.22 or 0.1mm ?

The effective offset should be -1.22. The M851 isn’t triggered by the Cura offset.

Good to know. so that’s a quick way to tweak the z-offset for a specific filament or project without losing my regular setting in the EEPROM (and I don’t have to know my current EEPROM setting to make a tweak).