sentences:  Under his direction, "Guide" both tested her new echo sounder's ability to make accurate depth soundings and conducted radio acoustic ranging experiments in cooperation with the United States Army Coast Artillery Corps.Despite many difficulties, testing of both echo sounding and radio acoustic ranging wrapped up successfully in November 1923.In late November 1923, with Heck aboard, "Guide" departed New London, Connecticut, bound for her new home port, San Diego, California, via Puerto Rico and the Panama Canal, with her route planned to take her over a wide variety of ocean depths so that she could continue to test her echo sounder.