Pilot watches are distinguishable by their legible and prominent dials. Designed to be quickly read by pilots, high-contrast hands are paired with a variety of simple dial layouts. The most common dial types are Type A (a 60-minute scale on the perimeter of the dial) and Type B (minutes in increments of 5 on the perimeter and hours measured on an additional inner ring). While many are free of complications, options are now available that include date windows and chronographs. Case diameters average on the large (38mm and up) side. GMT dual time aviator watches are included in this category, as well as watches that feature flight computer functions. Both quartz and automatic movements are common in this style, allowing for a variety of price options.