Regardless of the size, most NTSC LCD's are 320 x (rgb) x 234. A VGA lcd would be better in all respects except for price
Try using gps software at 320x240
Is a 6.4" or 6.8" video(ntsc) lcd readable/usable for GPS (delorme or MS Streets)
I have a 10.4" VGA lcd however its a bit large. Before I spring for a 6.4" VGA I wanted to look into the less expensive video monitors.
A4.Avant.Work in Progress...