<View style={{ flex: 1 }}>
      <MapView
        provider={PROVIDER_GOOGLE}
        style={{ flex: 1 }}
        region={{
          latitude: 41.20060,
          longitude: 47.18932,
          latitudeDelta: 0.0922,
          longitudeDelta: 0.0421
        }}
      >
                {
                  heritages.filter(h => h.x !== '' && h.y !== '').map(h =>
                    <MapView.Marker
                      coordinate={{
                        latitude: parseFloat(h.x),
                        longitude: parseFloat(h.y)
                      }}
                      title={h.title}
                    >
                    </MapView.Marker>
                  )
                }
      </MapView>
    </View>