Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 372Get this manual

Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 372

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D-GPS INSTALLATION PRECAUTION NOTE: Carefully follow the installation instruction when install D-GPS1) Keep the D-GPS unit and antenna at least (10 ft)
Opening Diameter 80.5 mm (3.17 in) 50.4 mm