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GPS-sounder combo 9 vs 12 inches — which screen size for which sailboat 2026

Choosing between a 9-inch and 12-inch combo determines 10 years of cockpit use. 9-inch = limited readability to 1 m, max 4 windows. 12-inch = 1.5 m readability, up to 6 windows. For a 35-45 ft sailboat, the 12-inch is necessary if budget allows. Raymarine Axiom, B&G Zeus, Garmin GPSMAP comparison + 2026 USD budget.