This looks very good, I appreciate all the work that went into it. I DO have a 
question (or 3) about how this could be applied to vectors (e.g. 
northward/eastward_sea_water_velocity or northward/eastward_wind), where there 
are uncertainties in both speed and direction, and the units for the 
directional uncertainty won't match the units for the vector. Unless I missed 
it, the proposal doesn't require that the units match, but I'd just like to 
double check that that wasn't assumed.

Also, can I include uncertainty as a percentage of a measurement? 

The  document doesn't spell out (again, maybe this is assumed) that  a single 
set of uncertainty variables can be applied to more than one data variables, in 
this case both eastward and northward vectors.  Is there any problem with both 
northward_ and eastward_sea_water_velocity sharing an ancillary variable (or a 
group of them) for this purpose?

Thanks!

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