About

Parameter data is generated from each ArduPilot firmware branch's apm.pdef.xml and collected in the ParameterRepository, which a bot refreshes every five days. This site flattens those files and searches them in the browser with fuzzy matching on parameter names and descriptions.

"latest" is the highest version folder available for a vehicle. Values, bitmasks, ranges and units come straight from the metadata; defaults are board-specific and are not part of it.