What GPS Has the Best Resolution?
When speaking about GPS resolution, there are two things you may be referring to. The first is the resolution of the screen or display, expressed as either a pixels per inch/dots per inch number, or in a height by width (#### X ####). This resolution will help determine how sensitive the screen is in touch screen models, and also how crisp and clear the image will be. The other form of resolution is a measurement of how accurate the particular GPS unit is. The best GPS units with the highest resolution, can pinpoint your exact location to within a yard as long as they have a continuous line of site to a minimum of four GPP location satellites.
For more info, see How to Select a GPS Navigation System