Ogdensburg Engineers Marine 812 Proctor Ave Knudsen Systems Inc. (KSI) is a US small business, female-owned and operated based in Ogdensburg, New York. We sell Knudsen echosounders manufactured by Knudsen Engineering Ltd. We are also a GSA Federal Supplier for US federal buyers. Ogdensburg NY Engineers Marine Knudsen System Inc www.knudsensystems.com echo sounder echosounder depth sounder depth recorder echosounders echo sounders fathometers depth sounders sub bottom profiler hydrographic survey navigation echo sounder echosounder depth sounder depth recorder echosounders echo sounders fathometers depth sounders sub bottom profiler hydrographic survey navigation Business Reviews Knudsen System Inc Testimonials