Originally Posted by
JasonD67
Google Maps or Here are as good as any, and free. Big problem you'll find is that an iPhone doing GPS guidance kills the battery very quickly -- like less than an hour riding probably. You can get turn-by-turn directions (though it's not as easy I admit) with a good bike computer like a Bolt or Garmin, with much better battery life.
Before my RFLKT died on me, I was using it with an iPhone 5, then an iPhone SE running Cyclemeter. Also connected to the iPhone was a BTLE/Ant+ speed/cadence sensor and HRM. I have done several centuries using this combination and have never fully depleted any of my iPhone's battery life. The only way you will kill an iPhone battery on an hours ride is to keep all your apps running in the background. Turning off notifications on all the apps that I don't really need to be notified of and force killing all the currently running apps except my cycling app gave me over 8 hours of battery life with a little to spare. You can save even more battery power by setting each app to not use cellular unless it's in use. Otherwise they will use your cellular to stay updated, even if they are not actively running.
I'm now using a Wahoo Bolt. Even though I'm getting a little better battery life than I did with my old system, to me, it really isn't enough to fully justify the cost difference on battery life alone. Unfortunately, they no longer make the RFLKT, so I did go with a GPS unit.