In response to the urgent global push for cleaner energy solutions, offshore construction has expanded significantly in recent years, with projections indicating even faster growth ahead. Yet, this rapid development has raised serious environmental concerns, particularly regarding marine mammals. Research shows that underwater noise pollution from activities like pile driving, drilling, and dredging can inflict severe harm on these animals, making their protection a pressing priority. Growing concerns over the impact of offshore activities on marine ecosystems have led to stricter legal frameworks in many jurisdictions. These regulations typically impose maximum permissible noise thresholds and mandate real-time monitoring of marine life near construction sites. Wind farm developers, in particular, are now obligated to assess, track, and minimize underwater noise pollution. Consequently, noise monitoring requirements have been widely adopted as a key conservation measure in national and international marine protection policies. This article describes the onboard processing and communications capabilities of the RTSYS acoustic buoys, optimized for real-time monitoring of coastal and offshore construction noise relying on over 10 years of underwater acoustics experience in the field.