Jim Hopper

Hello folks, I am in Canada and own a 2015 C300, I recently would like to update my map and searched around on ebay. It looked like map v11 is the most up to date one but it might not be compatible for my car. I asked the seller and he told me the v11 would work. I am not sure about this and don't want to waste money if I purchase something wrong. So what part number or which version of map data am I looking for to update my map? Thank you!!