It better be perfectly accurate and I doubt that.
I'm not an O&M instructor but I'd hazard a guess that most would recommend using a cane to find the "braille block" or as it's officially named, truncated domes.
Not enough ratings yet to assess Braille block.
Braille block appears to be a legitimate app. AppsHunter Legitimacy Score for Braille block is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.