Naxos is a major hub for the Greek ferries. Google Maps is excellent for tracking your ferry arrival, but be careful with pickup points.
Since Naxos has mountainous interior villages (like Apeiranthos, Filoti) and remote beaches (like Alyko, Panermos) where cell service is patchy: google maps naxos
Here is everything you need to know about using Google Maps in Naxos. Naxos is a major hub for the Greek ferries