This might be a really stupid thought I might have mainly just because of his name but let me explain. We know there is one poneglyph hidden that seemingly nobody has been able to find so far. This might be because everyone was looking for a classic stone poneglyph but in reality the last road poneglyph is different from the others as it's not carved into stone but it's actually a tattoo on the back of a giant. And Road's function in the Giant Warrior Pirates crew actually is navigator which would strangely fit. You can laugh now 
I would love this idea though, would be kinda clever imo and it would give this character as well as the things that happened in the first chapters of the Elbaph arc much more meaning. How about Road didn't show anyone the poneglyph tattoo yet because nobody impressed him so far and he wasn't really fond of Luffy and his crew before but he might change his opinion after Luffy manages to save Elbaph? I'm aware that the poneglyphs exists for hundreds of years but that tattoo could have been copied from generation to generation in Road's family. I admit though, it's more of a fun theory but I'd laugh really hard if it would turn out to be anything like this.
I would love this idea though, would be kinda clever imo and it would give this character as well as the things that happened in the first chapters of the Elbaph arc much more meaning. How about Road didn't show anyone the poneglyph tattoo yet because nobody impressed him so far and he wasn't really fond of Luffy and his crew before but he might change his opinion after Luffy manages to save Elbaph? I'm aware that the poneglyphs exists for hundreds of years but that tattoo could have been copied from generation to generation in Road's family. I admit though, it's more of a fun theory but I'd laugh really hard if it would turn out to be anything like this.
