About the map series The MTN50 (Mapa Topográfico Nacional) series from CNIG (The Centro Nacional de Información Geografica) provide topographic coverage of mainland Spain at 1:50,000 – the Spanish equivalent of the Ordnance Survey Landranger series. Each map covers approximately 29x18 km. The maps have a 1-km UTM grid, plus margin ticks for latitude and longitude at 1' intervals. The map legend is in Spanish only. CNIG also produce a series of maps covering the country at 1:25,000 scale which can be found here How to find the right map Use the 50k map index below to find the number(s) you are after.