Disclaimer: I’m not very well versed in NAV data, and I know this is too late and possibly too large for 3.1 inclusion.
I don’t see a way to define low-vis taxi routes as applicable to SMGCS in the NAV Dataset. Furthermore, some way to attribute airport lighting with SMGCS controllable segment information and correlate that to the low-vis taxi routes defined in the NAV data would be advisable for future CDB specification versions. I don’t yet have a scheme to propose, but I would be happy to collaborate in the development of such. Thank you.