I do not own a GPSMAP 740 unit, but I just looked on the Garmin web site and it shows that the GMI 10 display unit is compatible with the GPSMAP740. Is there some other 'repeater' that you were considering?
According to the garmin web site, the GPSMAP 740 uses both NMEA 0183 and 2000 networking, so it should work with any repeater.
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY
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