How far inland does Royal Navy hydrography reach?

Does the Royal Navy survey riverbeds and other inland waters?

Naval vessels work as far inland as access permits, then civilian Hydrographic Office teams and launches cover the shallower reaches.

Royal Navy vessels and civilian hydrographic teams divide the work in very shallow water. HMS Magpie and survey launches can work close inshore and proceed upriver while depth and access permit. Beyond their reach, the UK Hydrographic Office can manage surveys using civilian equipment and smaller craft. National charting is a networked service rather than a task performed only by large commissioned ships.