Here is a standardized list for imagery that the Wherigo Media Group follows as much as possible.   For both the PPC and the Garmin device, we hold to a 230 pixel width. However, we use different lengths to make the most out of the use of the media while playing nice with possible words and hopefully your eyes.   MEDIA SIZES: (height focused) [Width is always 230 pixels]   GARMIN: Zones : (all 1 size) NAME: zone(zone name)_garmin.jpg W/ Text : 18