I have a Garmin GPS for most navigation, but I do sometimes need the smart phone to find .gpx track files people share with me to find routes and such.
Below, I am the triangle shaped icon on the left- and the markers to the right of me are a trail or trails I am trying to get to, some or all of it gravel. I am just finished with exploring one trail, both ends of the trail are marked with icons. I can see that the big collection of the next trail(s) of interest are just out of the 10 mile ring around me.
I call it "sinking submarines", as it's like watching a radar screen. I have maps for three states around me with trails marked to go chase down. It's mostly a solo-hobby, couple of my chums have fancy bikes they don't want to get dirty.
The program is called LOCUS MAP PRO... it's free. A bit of a learning curve, but I have stumbled through it the last two riding years and had fun with it.
My normal deal though is, once I am done hunting trails and sinking submarines, I pack up my phone and get it off my bars. I don't want the distraction of a call or text coming in, nor do I want to be accused of dinking with my phone at highway speeds. Then I just fly the Garmin.