I have consistently made world mapping too hard. Quick and dirty world build my land and sea with d% rolls. Each number is the area of each bit of landmass or ocean. It's ocean if the # is greater than 29% or whatever your target land ratio is. Blob zero is at tht north pole, blob one is adjacent. This is quick and dirty, remember? 8-P

43, polar ocean 

65, adjacent ocean, may merge, 108 m. km^2 total, 0% land...

41, more ocean, 149 total

28, landmass!!! 28/177 is 15.82% land

Continue until we have an earth sized world, setting a default of ~500 m. km^2 surface area.

So far we have roughly the northern third of the world, the three ocean blobs would be a little more than down to ~30 degrees north latitude.