Actually, it applies to all the Garmins from what I've seen.
However, there is absolutely no need for him to spend any more boat bucks for a new GPS unit, unless he absolutely wants to. I have the GPSMap 76 CS and think it is an excellent unit. I also have a 192C mounted as the primary chartplotter in my boat.
The Garmin GPSmap 478 also has NMEA 0183 interface, and comes with the fancy cable that SD mentions above. I like that it is a GPS *AND* a usable Chartplotter. I believe that the Garmin 276C, 376C, 278, and 378 would work too... Look here for detail: Garmin. We'll Take You There.®
I'm not sure if the negative line goofiness applies to these units.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.