On my Android with Navionics East I can get Google Maps overlay on anything >sea level.
I have seen what Freak is talking about and YES it is worth it! Too bad no longer available. It does have a flaw in that you need access to internet signal which we didn't have Sat approaching that wreck which showed on the map!
Given the diversity of the human species, there is no “normal” human genome sequence. We are all mutants.