TY  - BOOK
ED  - Hydrographic Department. 
TI  - Admiralty list of radio signals : : Volume 6. Part 2, Pilot services and port operations : (ALRS 6-2, 1998/99) / 
T2  - Admiralty charts and publication NP 286 (2). 
U1  - 623.8932 23
PY  - 1998///.
CY  - Taunton, Somerset : 
PB  - Hydrographer of the Navy, 
KW  - Radio en navigation.
KW  - Radio -- Receptors y reception
ER  -