First of all - I think Navigraph Charts is a fantastic tool and had huge improvements lately. I use JeppFD for IFR flying IRL and wish it had even half the features Navigraph has…
I recently raised a point in the Navigraph discord and was advised to bring it up in the forums, and that was that magnetic variation (MV) is incorrectly displayed in the Navigraph app.
When clicking or searching for a waypoint, Navigraph Charts (at least, the desktop app) shows you the magnetic variation. This magnetic variation is incredibly handy for users who may want to copy or mimic radar vectors that are being given to an aircraft for a pilot intercept on an ILS, as self vectoring yourself can be difficult. The data on Flightradar24 shows a True track, so to translate this to a radar vector one must account for MV (and also wind).
The problem in Navigraph Charts is that it shows the MV as a stand-alone degree value and does not provide whether or not the MV is east of west. The saying “East is Least and West is Best” applies to translating True to Magnetic HDGs/TRKs. This means, if we want to correct for “xx°E” we would have to take our track MINUS (“East is Least”) the MV.
Although this may not pose much of an issue for some users, if you wanted to mimic radar vectors onto the ILS at YSSY Sydney, for instance (where the ILS/IVA is only given from radar vectors) you may choose to quickly click on a nearby waypoint to check the MV so you can get the vector right whilst observing your aircraft on the moving map, see below:
We can see here, that the MV is shown as “12.9°” but it doesn’t specify whether it is E or W, so you could easily make the mistake of adding 13° to a TRK instead of subtracting it - which leaves a potential 26° variation. If we compare this to what is shown on the AD chart, for instance:
At the end of the day, whether or not you personally find use in the MV being shown, it is something that can both be handy in the sim and is used very frequently IRL (from personal experience), and if you’re going to display it at all, you may as well display it correctly - because showing the MV without an E or W label is a little bit like a shopping cart with a dodgy wheel, you probably don’t care less, until you go to use it.