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| on the Humminbirds, adding a new external puck is also a less-expensive way to upgrade an older unit if you're often in low-signal areas. for example, if you have an older 16-channel internal antenna, you can get a new 50-channel external antenna and use that instead (along with upgrading your unit's software) - better accuracy (8 feet) and faster lock-on time as well. the new Humminbird internal units do have the 50-channel built in.
if you're networking more than one Humminbird unit, you can run one single puck through the Interlink and have both units use that signal. the upside is that you don't have two pucks mounted on your boat; the downside is that the puck is a half-boatlength away from your unit when marking waypoints, which makes for a slight built in location error.
if you're running two units with antennas as you describe wanting to do, you will be able to toggle either unit to use either puck - external or internal...but you'll have to go in and set that manually b/c the default is to use the local antenna, not the remote (other unit's) one.
Edited by lambeau 8/26/2010 8:48 AM
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