I think of the iPad/tablet/phone with Gaia, oruxmaps, locus maps, or Caltopo as the map component and kinda. backup gps. The main GPS is an external GPS antenna. Many times, the Tablet GPS is good enough to know where I am when combined with a decent too map on the device, but for tracking of data, I use external GPS due to accuracy.

"Going to the mountains is going home" - John Muir

"It is very expensive to give bad medical care to poor people in a rich country" -Paul Farmer

"Pain: The gift nobody wants" -Paul Brand