Uncrewed Surface Vehicles (USVs) have become more common in defense, scientific, and commercial applications. This presentation will discuss how long endurance USVs have been applied in diverse environmental monitoring tasks for commercial ports. Field results from operations in the Port of Singapore and Port of Prince Rupert (British Columbia, Canada) will be shared. In addition to reporting on operational outcomes and technical effectiveness an economic analysis of the utility of these solar powered, zero emission USVs will be provided.