In my system I get PGN 60928 - ISO Address Claim which looks like this:
2025-04-10T12:10:16.614Z,6,60928,5,255,8,f5,01,c0,2c,ef,aa,46,c0
The output of this is:

2025-04-10T12:10:16.614Z 6   5 255  60928 ISO Address Claim:  Unique Number = 501; Manufacturer Code = Victron Energy; Device Instance Lower = Unknown; Device Instance Upper = 29; Device Function = Battery; Device Class = Electrical Generation; System Instance = 0; Industry Group = Marine; Arbitrary address capable = Yes

It all makes sense except the Device Instance Lower = Unknown part. Are we sure they meant it to be unknow? it makes more sense to be 7. I think that at least some 3 bits number do use all the bits.

What do the NMEA 2000 experts think about this example?