I do a cross state ride every year and send info to my wife so she will know where I am during the ride. My computer, a Wahoo Bolt, has real time Live Tracking but requires it to be connected to a phone, as does a Garmin. The issue I have found with this is that, no matter how well you have your phone optimized for longer battery life, this method will go through a phone battery in no time at all on rides over two or three hours. Since it's constantly sending your location to it's host site, it also chews up a lot of data. So, unless you have an unlimited data plan, you may end up with a larger than normal cell phone bill. My solution was to revert back to my old cycling app, Cyclemeter, in order for my wife to track me.

If your phone is optimized for longer battery life, you can get a whole days worth of tracking without recharging your phone when using Cyclemeter. I have an older iPhone SE and on last years ride, it lasted the entire day before needing to recharged. Other cycling apps may have this same feature, but the one thing I like about Cyclemeter is that you can have it send the data every so many miles or so many minutes/hours. I have my set to send every 20 miles. So every 20 miles, it updates my location on the host site and sends my wife an email with the link to let her know the site was updated. It's not the same as real time Live Tracking but I don't have to carry battery chargers with me to ensure that my phone doesn't die on me during long rides.