Well I've only used it for the dogs so I can only go off of those but you may be able to use the functions in some way for riding.
You can track I think up to 20 dogs (20 collars) with one handheld, and the handheld/collars can also be connected to a Garmin Drivetrack and a Garmin watch. You can track your dog's pace and it will also alert you when the dog has stopped ("treed") and mark the point on the map. Depending on the SD card you have you can save a lot of routes and maps, too, and you can also upload the Birds Eye View which gives you a satellite view of the area you are in based on whatever state you purchase which comes in handy if you are trying to avoid hazards such as cliffs, roadways, private property, etc. It has a very good range and battery life and you can buy additional batteries and I think somewhere I found a solar powered battery charger for it so you don't need to plug it in if you are in the backcountry for several days at a time. It is also fairly indestructible if you get a good case for it as my friend has dropped his dozens of times (out of the truck, into the river, off a cliff...). He's had his for about two years now and it is still going strong. I think he had one issue with a battery and he called Garmin and they sent him a replacement for free. They also sent him the wrong size collar when he first bought it and they immediately sent him a free larger size collar. So good customer service.
It also doubles has a training collar so it has tone, vibrate, and shock functions although you probably do not have a use for those haha! We have taught the dogs to come back to us when they hear the tone.
You can find more information and a whole bunch of accessories on Outdoor Dog Supply
which I think is the best supplier outside of buying from Garmin directly (and maybe even better than Garmin). They also have refurbished models every now and then so you may be able to buy one cheaper.
There is also an older model that is the Garmin Astro. It has similar functions but is not as high tech, so you may look at that one if you don't need all the fancy doo dads.