USML is not designed to run "real-time," though in your case what this means depends on how you're using it.
If you're just using it to control how bright lines are on your sonar display, you should be OK with it producing results every few seconds.
If you're trying to use it to generate actual acoustics (sound), you'll definitely run into problems. For one, it's designed to give more of a qualitative overview of the ocean environment, so it doesn't necessarily provide the kind of detail you'll need to generate the actual sound you'd hear. The fact that it is also slow means it'll be very difficult to generate acoustics without extensive interpolation/extrapolation of the model's output.
Using the eigenrays will pose a big challenge to you as well. Expect the model to generate thousands of eigenrays for a single point-to-point run. How you use those eigenrays will dramatically affect the overall presentation of the ocean, and will be important especially for how multipath effects show up.
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