RESON Group
The RESON headquarters are located in Denmark. RESON subsidiaries are established in the USA, UK, Germany, Netherlands, Italy, South Africa, and Singapore.
http://www.reson.com/

Skipper Electronics AS
Skipper Electronics - supplier of ships electronics
http://www.skipper.no/

Odom Hydrographic Systems Inc.
odomhydrographic builds a precision hydrographic echo sounder, velocimeter, multibeam, Stema Survey Services, silt, densitymeter, viscosity, rheological properties, in situ density, profiler software, shallow seismic software, high resolution seismic, echosounder software, dredging solutions, Silas software, DensiTune
http://www.odomhydrographic.com/

L-3 Communications ELAC Nautik GmbH
ELAC Nautik GmbH is a leading company in the field of sonar technology. Company's activities cover research & development, production, sales & marketing as well as service of echosounders and sonar systems and components and other related products for navigation., defense applications and survey.
http://www.elac-nautik.com/

SonarData Pty Ltd.
World leaders in fisheries acoustics software compatible with most echosounders
http://www.sonardata.com/sonardata/default.shtm