Problem is that there is no true Marine Grade Double Din regardless of brand. Yes, there are Marine Grade Single Din, and Marine Grade "Gauge" style, but no true Marine Grade Double Din.
Closest is the Sony XAV-AX#### series. While there are Youtube videos showing it being "rained" on and surviving, Sony specifically excludes water damage in their warranty. Even the head units for the Harley's are not waterproof.
Closest I've seen to a "double din size front plate" is the Rockford Fosgate PMX-8. But it's not exact and requires an adapter plate to make it "look like" a double din.