Operating from Tianjin, Tianjin Ocean Telecom Technology Co., Ltd. is a marine radio and navigation electronics service house focused on the statutory communications and AIS requirements of merchant tonnage trading through Bohai Bay. The Ocean Telecom team mobilises engineers to vessels at Tianjin Xingang, Caofeidian, Qinhuangdao and neighbouring terminals, and carries out GMDSS annual radio surveys in line with SOLAS Chapter IV and IMO Resolution A.1115(30), covering vessels operating in Sea Areas A1, A2 and A3, together with GMDSS equipment service on MF/HF and VHF DSC radios, Inmarsat-C and Fleet terminals, NAVTEX receivers, EPIRBs, SARTs and two-way VHF radiotelephones. AIS Class A annual performance verification is delivered against IMO MSC.74(69), with antenna-system checks, GNSS sensor alignment and connectivity tests to ECDIS and pilot plug terminals, supported by calibrated AIS test sets. The team also supports voyage data recorder annual performance testing and broader NDT and remote inspection work on antenna foundations and mast components for condition monitoring of communication and navigation arrays. Technical-bench equipment includes calibrated RF measurement instruments, DSC simulators and AIS test sets to ensure repeatable and class-compliant results. Owners and ship managers are offered repair quotations, spare-parts supply and warranty handling for major OEM brands. The company is recognised as a service supplier by the China Classification Society, allowing the certificates and reports it issues to be accepted by attending CCS surveyors and Chinese flag-state authorities for radio and AIS-related statutory inspections on a wide range of tonnage. The Ocean Telecom workshop also supports repair, exchange and recommissioning of damaged radar, ECDIS and gyrocompass equipment, working closely with shipowners and ship managers to minimise off-hire during emergency call-outs at Bohai ports.