I'm just a layperson but I doubt it was one thing that helped them navigate. It was more like a lifestyle, to navigate the waters. Just like today some people

I'm just a layperson but I doubt it was one thing that helped them navigate. It was more like a lifestyle, to navigate the waters. Just like today some people are born next to waters and are very comfortable there. Norwegian kids sometimes get a boat as a present when they're 10-12 years old. Still today. So it was more likely a combination of skills like using sight, sound, feel, smell, birds, crystals and whatever else they knew that wasn't written down. I recently read that in the south pacific natives were navigating by sticking their body into the water and feeling the currents. The human has a lot more than 5 senses after all.