It really depends on which Garmin you're sending the data into. Different models will recognize different NMEA sentences. Most of the smaller standalone Garmin chartplotters won't recognize much more than Velocity through water, Water temperature, Wind speed and heading, or so.
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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.