Garmin Nuvi 1410 - Sub Saharan Africa Maps Required

Hi All

I have been trying to get an update for my Garmin Nuvi 1410. I have Garmap 2010 version currently installed in it and i am looking for an updated map that includes All countries for basically the entire african continent as i do extensive travels. Where can i get a suitable free download or update that will give me access to this please help ASAP? TIA