Matt from Working Title here.
Waypoints with the label USR or USER are generally non-ICAO leg terminations generated by the stock sim flight plan system. In other words, in nav data, procedure legs are very often described in relative terms: fly course 245 until 6NM from OBK, for example. The ends of these legs (the terminators) are not specific ICAO nav points, and thus don’t have a predetermined name in the nav data. It is up to the GPS/FMS to name these.
Right now, the sim flight plan system names these relative or non-precision non-ICAO fixes with the label USR or USER, which is not correct. Generally units follow the ARINC 424 standard for naming conventions of these (although not always, for example, heading/course to altitude fixes get a name like (1200) on the ProLine 21). Additionally, the stock flight plan system drops or miscalculates the terminations for a number of relative leg types, so not only do users see these strange fixes, they also see them in the wrong locations as compared to the procedure chart. This leads users to believe that the stock NavBlue navdata is junk, when actually it’s quite good, it just isn’t interpreted properly by the stock plan system.
We built our own flight plan manager outside of the sim for the WT CJ4 to avoid these issues, and as such even with stock navdata you’ll find that you’re almost always matching the chart.
-Matt