Rongcheng Shidao Yonghong Electronic Co., Ltd. is based in Weihai, with operations centred at Shidao in Rongcheng, a Shandong Province coastal city on the eastern tip of the Shandong Peninsula that hosts substantial fishing-fleet activity alongside the Shidao Group shipyard and a number of cargo and refrigerated terminals serving coastal and international trades. The firm provides on-board technical attendance covering radio-survey and non-destructive testing scopes for commercial vessels calling Shidao and Weihai-area berths and the surrounding Yellow Sea anchorages used for crew change, bunkering and routine maintenance during ordinary commercial calls. Radio-survey services cover GMDSS annual testing on MF/HF and VHF radio installations, EPIRBs, SARTs and NAVTEX receivers, alongside GMDSS equipment maintenance, AIS annual inspection with verification of static and dynamic data and VDR and S-VDR annual performance testing in line with IMO performance standards and the relevant SOLAS chapter V requirements. Non-destructive testing covers ultrasonic, magnetic-particle, dye-penetrant and visual examination of welds and structural members on tonnage in repair, with reports issued by qualified Level II technicians in formats accepted by attending classification surveyors. Shidao Yonghong holds service supplier recognition by RINA, Bureau Veritas, the China Classification Society and the Korean Register, allowing radio, VDR and NDT records to be considered during periodical, intermediate and special surveys on commercial tonnage trading through the Yellow Sea and calling the Weihai, Shidao and Rongcheng terminals. Field teams attend at berth and anchorage with calibrated test gauges and GMDSS bench equipment, supporting routine renewals and short-stay maintenance during commercial port calls. Customers include shipowners, fishing-fleet operators, ship managers and port agents arranging attendance in the Shidao, Weihai and Rongcheng port areas.