Yes, I am familiar with that kind of approach. However, something like 'geohash.org/eyckqv01zy2v' is not what I mean because it is similar to '38.7436214,-9.195

Yes, I am familiar with that kind of approach. However, something like 'geohash.org/eyckqv01zy2v' is not what I mean because it is similar to '38.7436214,-9.1952231': both can only be communicated by copy-and-paste. You missed the word 'readable' in my post ;-)