If you're looking for C-MAP charts, the best method to see what's available is to use C-MAP's Chart finder: https://www.c-map.com/search-charts
Input the desired location, "FURUNO" for brand, Chart plotter model (e.g. NavnetVX2 1834C/NT), Chart type (e.g. "Max"), and Coverage (e.g. "Wide") and press search and use the map to zero in on the chart product SKU. Than contact your local Authorized C-Map dealer for ordering details.