EZ Guide 250, Trimble, DGPS, Patch Antenna. Trimble EZ-Guide 250 Lightbar Guidance System. With common-sense interface and a color screen, the EZ-Guide. 250 lightbar is easy to operate right out of the box. Provides submeter DGPS accuracy with included low-profile patch antenna, or 68 pass-to-pass accuracy with optional Ag15 antenna. Optimized guidance accuracy with OnPath. …