i Just add topo map into my Nuvi's,255W much better than 2465 in detailed and read ability,but Nuvi 2465 has built in compass,so for hiking or navigate in the jungle,i'm prefer for new unit with built in compass,this idea came when i'm in my 4X4 activities in the forest,no road has been recorded,so the topo map give a help to understand the surrounding area around me.