You have a GPS unit that doesn’t read TCX files.Unless you know what you are doing, GPX Routes are not as useful and should be avoided. Since the maps inside the GPS unit are different than the Google maps used to plan the route, often times the route chosen by the GPS unit will be slightly different than the one planned using our site. GPX Route only contains the cuesheet entries, and relies on the GPS device to calculate a route between each of the cuesheet entries. Your GPS will follow this track and is the next most common format we recommend for units that cannot use a TCX Course file. GPX Track This file type contains the thousands of points used to draw the map. There are two kinds of GPX files: GPX Track and GPX Route. Export as a TCX History if you wish to transfer a ride to another service or application for analysis. TCX History files contain the entire track of the recorded ride including sensor information like heart rate, cadence, and power if applicable. At this moment, we do not have the capability to export a *route* with these average speeds, however if you export a TCX of an existing activity that you have done, you can race against the speed you went when originally riding on that activity. You are interested in the training capabilities of TCX Course or FIT Course files, meaning, you want to export a route with a set speed, and you want to get alerts when you go above or below that speed.This allows you to get alerts when you approach your custom cues, while still using the fancy navigation capabilities of your GPS unit. Using a TCX Course or FIT Course file will still allow your GPS unit to have the fancy turn guidance you get when you have a quality map installed on the GPS, however you will also get the simple beep/icon style navigation of the TCX. Your GPS unit has fancy maps installed, but you have custom cue entries like water and food stops.That’s fine for most people, since it’s just a reference – most of the time you have an idea of where you are going and just need an auditory beep to make sure you don’t accidentally pass a turn. Often, the beep you get with the very simplistic turn by turn directions of a TCX Course or Fit Course file occurs as you are in the middle of the intersection, meaning it doesn’t happen in advance of the turn.Garmin’s are limited to 10 characters, so we attempt to strip out irrelevant text from the cue, leaving just the street name if possible. An abbreviated 10 character description of the cue will also appear. When you come close to the cuesheet entry, your Edge will beep and an arrow icon will appear on the map.TCX Course and FIT Course files contain the cuesheet generated when mapping a route using our planner.You have a GPS unit that does not have mapping capabilities (Edge 305/500) but want turn warnings, or you have a GPS unit that has mapping capabilities (Edge 705/800) but you did not purchase the microSD card that contains the mapping/routing information which provides the nice GPS style turn guidance.Three reasons you would want a TCX Course or FIT Course file over a GPX: