Y'know, everyone says it takes so long to sail, but I beg to differ. I timed myself, and it takes about 1 minute to travel all the way across a sector. Sure it takes a while, if you stop at every island that's in your path! Also, there are always warps.
I also noticed something that correlates with Big Octos. Do you notice how there are two different types of sea calmness? There's calm, which has no tide at all and is usually found at large and major islands. This type also occurs in areas with Big Octos. The other type is rough seas, where the water looks like rings of whitewash. Big Octos cannot be found here, but here's what I found out: If you defeat a Big Octo, the water in that area will change from calm to rough. That's all I've noticed at this point.
Here are some visual aids:
Rough --------------Calm
I also noticed something that correlates with Big Octos. Do you notice how there are two different types of sea calmness? There's calm, which has no tide at all and is usually found at large and major islands. This type also occurs in areas with Big Octos. The other type is rough seas, where the water looks like rings of whitewash. Big Octos cannot be found here, but here's what I found out: If you defeat a Big Octo, the water in that area will change from calm to rough. That's all I've noticed at this point.
Here are some visual aids:
Rough --------------Calm