I'm sure someone was down there and may be able to provide confirmation. On a side note my sister recently finished a trek in Central America, solo in most cases, and I hooked her up with one of these before she left ... she originally just wanted to send text messages via cell but I won the battle: http://www.findmespot.com/en/index.php?cid=100
Works great, battery lasts 10 days and small price for peace of mind.