I am afraid I don't know what you mean by sending units.
It is a stand alone Humminbird GPS/Sonar with Side Imaging. It can be networked to other Humminbird units and peripherals though the Interlink system. Any Humminbird dealer carries these networking items. I never networked it as I only used it for Side Imaging and use my Lowrance HDS for everything else. But with Lowrance Structure Scan now I don't need this unit anymore as my other units are networked and are not compatible with a different brand obviously.
As far as maps go, it has a base map, but any Navionics or Hot Maps SD card will work.
Colin
_________________ Hooksets are free, so when in doubt, hit 'em hard!
Colin Friel
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