The four sailing yachts operating in Istanbul work with the city wind patterns rather than against them. The Bosphorus generates its own local wind system, channelling the prevailing northerly along the strait and creating reliable afternoon breezes in the Marmara Sea that suit keelboat sailing well. The Princes Islands, a group of nine car-free islands half an hour downwind from the city Asian shore, are the natural sailing destination for most Istanbul charter weeks: they provide sheltered overnight anchorages, clear water for swimming, and enough separation from the city to feel genuinely remote despite being visible from the Bosphorus bridges. Istanbul sailing charter yachts range from 28-metre offshore cruisers to traditional timber gulets with large deck areas, all crewed by captains familiar with the Bosphorus traffic separation scheme and the Marmara short-period summer chop. Charter rates for sailing yachts in Istanbul start at around 15,000 euros per week and rise to 65,000 euros for larger vessels in peak season. The advance provisioning allowance covers fuel, food, marina berthing and drinks, typically adding 25 to 30 percent to the base fee. May and June are popular sailing months in Istanbul because the city is at its most visually dramatic before the summer haze settles, the Princes Islands are practically empty, and the wind patterns are at their most consistent.