This Recommended Practice specifies a set of standard practices and message formats for use in the navigation technique known as Delta Differential One-Way Ranging (Delta-DOR). The current issue adds clarifications, adds a subsection on quantitative validation criteria, renames 'Service Request' to 'Support Request', adds Support Request specifications, adds examples of Support Requests as new annex, deletes section 7 in favor of reference to the Delta-DOR Quasar Catalogue.