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As far as NMEA is concerned, the benefit would be the use of other software other then Garmin's. Whats nice though, on some units, Garmin gives you the Sensor Config software which really gives you a decent amount of mobility such as transfer speed, which sentences the unit will transmit, and some other factors. But still doesn't allow you to edit the needy-gritty things.
I here use the Garmin 15H Unit, and must say the receiver does a great job with satelite capture. Even like today when it was litterally tourrential downpour of cats and dogs (rain) the Garmin had no problem catching me 12 out of 12 satelite on the Long Island Expressway where my Earthmate equivilent has never gotten that sorta reception. But I must admit, the unit does tend to loose satelites easily, but I think I know why.
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