Garmin GMR 190-00669-02 - Manual (Page 13)

GMR 404/406 Marine Radar Installation Instructions 
5.91″
5.51″
7.87″
7.87″
L 12.87″
326.8 mm
12.34″
17.35″
Model L
GMR 404 51.6" [1310 mm]
GMR 406 75.7" [1923 mm]
313.5 mm
440.8 mm
200.0 mm
200.0 mm
140.0 mm
150.0 mm