To get settings of filtration of unit position information in messages, use the command unit/get_messages_filter:

svc=unit/get_messages_filter&params={"itemId":<long>}

{
	"enabled":<uint>,		/* 1 - enable filtration of unit position information in messages, 0 - disable */
	"skipInvalid":<uint>,		/* skip invalid messages */
	"minSats":<uint>,		/* minimum satellites */
	"maxHdop":<uint>,		/* maximum HDOP value */
	"maxSpeed":<uint>		/* maximum speed value */
	"lbsCorrection":<double>		/* allow positioning by cellular base stations */
}