Cool idea but are these really that useful for saddles? Feel free to correct me if I’m wrong about this, but my understanding is that if the tile/trackr is out of range of your phone, you cannot locate it directly. For you to locate your saddle, a person using the app will have to be near it before the thief finds and removes the tile/trackr.
“One key factor to remember with both of these networks is that their crowd GPS techniques rely on strong communities of users. That means that people who live in more densely populated areas, like big cities, are more likely to have luck when tapping the crowd for finding lost things. And, of course, the product has to have a lot of people using it in order for the crowd GPS to really work well.” (http://recode.net/2015/04/01/trackr-vs-tile-the-lost-and-found-face-off/)
Also, based on my experience with a Tagg dog collar, if you’re out in the boonies and cell signals are not good, you may not receive GPS data at all.