THE ADVANCED MANUAL IS A MUST-HAVE LEARNING TOOL FOR  OWNERS OF HELIX & CORE SERIES UNITS. THE MANUAL PROVIDES A TRUE UNDERSTANDING OF FUNCTIONS AND OPERATING SYSTEMS. THE MANUAL IS AN EFFORTLESS READ AND A GREAT REFERENCE TOOL WHEN DIALING IN UNITS ON THE WATER. ELECTRONIC FISHERMAN'S RECOMMENDED SETTINGS GIVE USERS A STARTING POINT AND WHILE ALSO PROVIDING BREAKDOWNS ON WHAT STEPS TO TAKE TO CLEAN UP IMAGES ON ANY BODY OF WATER. THE MANUAL REVEALS ALL OF THE CAPABILITIES THAT HUMMINBIRD UNITS HAVE TO OFFER. DANNY HAS DONE EXTENSIVE RESEARCH, HAS AN ABUNDANCE OF INSTALLATION EXPERIENCE, AND HAS TRANSCRIBED THIS KNOWLEDGE INTO THE MANUAL. CUSTOMERS THAT PURCHASE OUR MANUAL ARE GUARANTEED TO GET MORE USE OUT OF THEIR UNITS ON THEIR BOAT.