possible upgrade for akoji's long range

so as we all remmber in chapter 397 young akoji (22 years ago) used 2 long ice lines for kid robin that reach another island which should be at least hundreds of miles coz its not visible and we saw marine ships but still there is no lands behind them here is picture of young akoji also this is 22 years ago akoji whos a VA(Which is vice admiral) and ofcourse current akoji is much stronger thanks whats your thoughts (i posted this on the one piece discussion and no one answer so here again)

Distance between islands are unknown and distance to horizon is usually a few kilometers long. This is only a supportive feat.

hmm tbh it doesnt make any sanse if its a few km away but

you could see akoji and there is nothing behind him it should be at least dozens of km if not 100s km

also you could take this one or not but we could see navy ships far away and nothing was behind them

Again, the distance between the islands is unknown. It could very well be just 5 km away and we wouldn't be able to see it.

His Ice Age feat is more impressive because he froze the sea connecting three islands at the same distance from each other while it couldn't be seen from the horizon.