RADIO REPORTING (CALLING-IN) POINTS 
Vessels sailing along Uruguayan and Argentinian waters are
required to participate in the Traffic Control Centres and
Maritime Information System, Río de la Plata Traffic Control
System, and Martín García Channels Communications System
(SICOSEMAGA). For further details, see Published Maritime
Information (IMP Uruguay, Uruguayan Coast Guard),
Publication H-221 (Argentine Hydrographic Service) and
Regulations on Uses and Navigation of Martín García Channels
(REMAGA)

DELTA ZONE: Control Colonia Prefectura Radio (CWC 23) VHF 16
S1 ZONE: Buenos Aires Prefectura Naval Radio (L2G) VHF 70