To expand its base of subsidiaries Northstar Electronics, Inc., a holding company with executive management specialized in design engineering, defense, advanced systems, security, sonar, systems integration, and prototyping fields informs of a letter of intent to purchase Echotec Sonar Corp, a cutting edgei manufacturer of High Definition Omni Sonar (HDOS) specifically targeted for the defense, scientific, commercial shipping and commercial fisheries markets. Echotec Sonar designs…