There is no such thing as 'shipping lanes' on the high seas, just areas of greater or lesser traffic density.
The track from
Hawaii to
Alaska cuts across just so many routes. Multiply the number of
ports between
Panama and Alaska by the number of
ports between Yokohama and
Singapore and that's the number of shipping lanes.
Close north of Hawaii and that northern track through the Aleutians seem to be the busy spots just now.
I use marinetraffic pre-voyage to spot where large concentrations of
fishing boats are working so I can try and avoid them (2nd pic) or at least know where I am going to encounter them. They do move around but in the short term - maybe a week or so - it seems to
work.
Some
parts of the world 'shipping lanes' are fairly well defined ( 3rd pic). The big red smudge uper left is where there were masses of
fishing boats in 2019.
Sailing north from Antofagasta I laid a course up the coast just inside the 200 mile Peruvian economic zone and didn't see one while staying far enough
offshore to avoid any encounters with local boats..