The HB comes as a complete package...head unit, internal GPS antenna. 2d/DI/SI xducer...
You might consider buying a Navionics map for your home lake...
Check here....NAVIONICS: The Leader in Electronic Charts
Maybe greg or someone can post if your 747 is able to connect to the 798 via interlink to share sonar info..I'm not sure..
Ask lots of questions...many people here very knowlegable in SI/DI
Rickie


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