0 a narrow area of water, such as a river or canal, that ships or boats can sail along -- vía navegable
1 a channel, eg a canal or river, along which ships can sail. -- canal navegable
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Podemos completarlo paso a paso, por muy largo que sea el camino, y no se puede completar, por corto que sea el camino, si ni siquiera marcas tu huella.