FltPlan Go on an android tablet/phone. VFR sectionals (or Jet Hi/Low, OSM, other charts) with waypoints, approach plates etc you can OVERLAY on the map while flying. It’s a real flight navigation app, but they’ve made it so you can use it with flight Sims.
Tracks your aircraft along the route. It has airport diagrams which you can also use to taxi as it will also track your aircraft on them. It’s also free.
The best payware for Apple would be ForeFlight.
As others have mentioned LittleNavMap is great if you use another window/monitor. You can also download a mod which adds it to your in-game shortcut tabs. I use both FltPlan Go and LNM.