VISUAL (POWERED AIRCRAFT)
0 - 2,000 AGL ±1NM ( ±2NM by night)
2,001 - 5,000 AGL ±2NM ( ±3NM by night)
5,001 - 10,000 AGL ±4NM ( ±5NM by night)
This is for visual navigation, and it makes sense en-route to apply higher tolerances the higher you are, and at night.
Where is the list for GPS? Or is that yet another regulator that doesn't think it should be used?