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[glenp]

I know there are datasets out there...but where do we stand on higher-resolution mapping of the world ocean and sea floors?

I'm curious to see if there is something I could use to represent submarine terrain in the Caribbean Sea that will hold up well at a scale of 1:4M.

[frax]

For global datasets, there are SRTM30plus and GEBCO. The basis for global data is the Smith and Sandwell dataset, prepared at 2 minutes (repackaged as ETOPO2). There is also ETOPO1, but I understand that it has been criticized for just upsampling the Smith and Sandwell dataset.