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Editing Step 41 —

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Ballasting your OpenROV is key to a good dive performance.

More ballast (weight) will be required for salt water than fresh water.

Adding weight to the front threaded rod is the recommended ballasting method, though there are many others.

Weight should be distributed evenly from left to right and slightly in biased towards the front.

The ideal is to have a neutrally buoyant OpenROV so that it neither sinks nor floats. Test this by placing the OpenROV into the water and adding weight one at a time until you are just barely afloat.