2.25 hours later and we're moving again and medicinally sound. The park Zark was probably because we were directly downwind of the line of islands.
Later still - the sun sinking behind a confusion of different level cloud - mostly wispy but with strands going in every direction. Seemed for a short time that we were under the centre of a big circular swirl but it just got all confused again. Smoky crescent moon to the south - we're heading a bit further east than ideal but tomorrow will dictate what we do. The next 1000 miles or so to the equator will be critical - and probably difficult.