And I thought tectonics were confusing (please critique my currents)

[Azélor]

Sorry why is not possible?

Actually, let me explain it better.

First we assume that the planet is a perfect sphere. It's not perfect but the different is very small and it's simpler to work with a perfect sphere.
On a sphere, the pole is simply a dot.
The funny thing is that a dot is a 1 dimension thing, so the area covered by the dot is actually 0.
Therefore to be honest, it's not possible to map the pole.
I guess we have to stop at the latitude 89,99999999...
But this extreme latitude is so close to the pole that it is extremely small. It's size approaching nothing as you move closer to the pole. The infinitely small.
For sanity, we'll assume that it ends when there is only a single atom left. And that is the top and bottom of your map, your poles.
So if the whole latitude is made of only one atom, can it be made of 2 different elements at the same time? Not with current physics, as far as I am aware.
So that's the thing, the pole approaches the infinitely small.

About the current depth:
Most current maps feature only the surface currents, not the thermohaline circulation.
We still don't fully understand the deep water currents and are trying to find how climate changes will have an impact on them and how these current influence the climates.
So I usually avoid including them. That is why the currents are usually hugging the coasts.

The other thing is that it's a simplification. The real current map is the one you linked it the first message. There are many counter-currents, seasonal current, mini gyres, or currents that flow right under the main currents.
All the water in the ocean is constantly moving and it would be very complicated to represent this accurately on a fantasy map. But you are welcome to try as it would probably look awesome.

[Naima]

First we assume that the planet is a perfect sphere. It's not perfect but the different is very small and it's simpler to work with a perfect sphere.
On a sphere, the pole is simply a dot.
The funny thing is that a dot is a 1 dimension thing, so the area covered by the dot is actually 0.
Therefore to be honest, it's not possible to map the pole.
I guess we have to stop at the latitude 89,99999999...
But this extreme latitude is so close to the pole that it is extremely small. It's size approaching nothing as you move closer to the pole. The infinitely small.
For sanity, we'll assume that it ends when there is only a single atom left. And that is the top and bottom of your map, your poles.
So if the whole latitude is made of only one atom, can it be made of 2 different elements at the same time? Not with current physics, as far as I am aware.
So that's the thing, the pole approaches the infinitely small.

Sorry I still do not get it, are you saying that on a planet there is no possibility to have poles without Land?