MML can be used to inform RPW of land registrations, new or changed permanent features, boundary changes and transfers of land.
Gellir defnyddio MML i hysbysu RPW ynglŷn â chofrestru tir, cyflwyno nodweddion newydd, neu newidiadau i nodweddion parhaol, newidiadau i derfynau a throsglwyddo tir.