RICHMOND, Vt. (AP) — Several times a week during the summer, engineers from Richmond’s Greensea Systems take their remotely operated underwater vehicles to Lake Champlain, where they test navigation software they are developing that could end up being used in the world’s oceans.

Their renovated building by the lone traffic signal in downtown Richmond is a long way from saltwater, but the software being developed there for offshore industrial work and for military applications or other government uses provides a glimpse of Vermont’s small but economically significant, high-technology sector.