The Food of the Angels, a bland, nutritious and filling paste, which is mildly addictive, said to be eaten by the greatest warriors of the Sky People. It is lightweight, can be eaten straight from the container, stays edible for years and takes up less space than conventional food. It is in fact guardsmen grade corpse-starch paste rations with some mild chemical enhancements to encourage guardsmen to actually eat the stuff.
The Sun-Sailers, rare ships gifted from the sky-people, that move without sails, giving their helmsmen the ability to sail against the currents of the world sea. Solar powered watercraft, mostly on the small side. Not particularly fast, but made of tougher materials than the local vessels and driven by an electric motor rather than the wind. Biggest I'd shoot for is the size of a small yacht, room for about 8 people to stay in cramped conditions.
Windspeakers, arcane devices that foretell the weather, warning of storms or the deadly absence of wind that can leave ships adrift and lost. A form of auspex, mostly designed to predict the weather up to a few days in advance. Not always accurate, but will always manage to predict weather anomalies, such as rains of fish or amphibians, or the arrival of a crotalid migration, successfully for some reason.
Similarly, the Deepseers, rare and coveted items that can find and track schools of fish, whale-like creatures and other valuable sea creatures so that fishermen can find them more easily, as well as warning them of perilous features of the ocean such as coral reefs or sunken ice floats. Usually kept in well secured places when not in use, like the fortresses of nobles, because of how vital they can be to feeding a large community. It's a sonar device, capable of detecting large groups of small sea life, or individual large sea creatures as well as detecting things like reefs or large seaweed floats. Some are self powered, others need external power sources to function.