Would a standard issue Dungeons and Dragons Ring of invisibility count as minor magic? Basic rules of invisibility being
No attacking or you become visible.
You still leave signs of passage. (footprints, broken branches if in the forest, sounds of footsteps)
While invisible, you're not intangible. You're still solid, you simply can't be seen.
If someone is trying to detect magics being used in the area, you show up. Like a road flare.