so I've acquired a nuvi 50, and I'm wanting to update the maps on it.

From reading I've found i can use the ntu maps, so downloaded the U.K. Ireland maps from
City Navigator Europe NT (Unicode) 2015.10

do i just need the jvc file linked underneath the lin for the U.K. Ireland download on that page?

whats all the other files listed at the top ? SID, DB G2S?