But then there is this
"People in the group that played action video games lost gray matter in the hippocampus"
http://www.npr.org/sections/health-shots/2017/08/09/542215646/video-games-may-affect-the-brain-differently-depending-on-what-you-play
""In the majority of action video games, there's an onscreen GPS overlaid on the screen," West says. "There's also wayfinding markers overlaid over the environment, and we know from past studies that when people are encouraged to navigate using these cues, really, they're not using their hippocampal memory system to navigate.""
Yeah, so using maps weakens your hippocampus? Same could be said for phones…