A boat used for :
- carrying out repairs and maintenance to fixed aids to navigation
- handling smaller buoys
- relief of personnel and fuelling and provisioning of lighthouses and light vessels.
No special term exists for this in German, but the general term Seezeichenfahrzeug includes work barges used by the lighthouse services (See note to 8-1-000).
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)