Quartermaster, a U.S.-based maritime data firm, has raised $43 million in a Series A funding round co-led by First Round Capital and Quiet Capital. The Arlington, Virginia-headquartered company aims to improve maritime monitoring with its SmartMast system, which integrates cameras, radios, and sensors on ship masts to provide real-time data. This system addresses the limitations of the current AIS system by offering richer sensor data and enhanced analytics, covering over 600 vessels and 10 million square miles of ocean. The new funding will be used to expand Quartermaster's engineering team and advance product development. The company plans to leverage network effects rather than selling individual sensors, aiming to enhance maritime intelligence and provide more reliable commercial services. Quartermaster's technology has already contributed to over 20 maritime rescues, highlighting its potential impact on maritime safety and monitoring.