It seems that the two guys who were running the business of selling GPS maps for Panama did split and one of them is selling the so-called new version (3.3.8) that has some minor changes (according to the info posted on its website). The other guy seems to be selling the version that is posted here (3.3.4). Both are claim legal ownership of the map and are involved in a legal dispute.
I am not from Panama, but I have a friend from Panama who lives in my building and he used version 3.3.4 in a recent trip that he did early this month. He says that is quite good.