[TrisQuinoline]

There is a startup in Norway called Glint Solar that may help. They serve the floating solar industry with geospatial tools and data, both on reservoirs and offshore. If you can expand a bit on your questions, there may be more resources to point to.

[algo_trader]

Currently interested in year-round solar irradiation data for seas and oceans (mostly over shipping lanes)

It seems that out to sea (over 100 km from shore) solar actually weakens due to humidity/clouds?