1. TCX Course - Best format for turn by turn directions on Edge 500, 510. Will provide true turn by turn navigation on Edge 800, 810, 1000.2. GPX Track - Useful for any GPS unit. Contains no cuesheet entries, only track information (breadcrumb trail). Will provide turn by turn directions (true navigation) on the Edge 705/800/810/1000.Sorry, but we cannot provide advice for other makes of GPS device!