One thing worth noting about navigation aids in this kind of weather: Yes, they are extremely useful, and you should make full use of them. But there is a real danger that if you spend too much time heads-in watching the navaids, you will inadvertantly enter IMC.
As long as you are aware of this, and make a concious effort to focus your attention outside with only occassional glances at the navaids to confirm you position, any navaid will be a great help, but without being aware of the potential danger you might find you're worse off with the navaids than you would have been without them.
(This obviously doesn't apply so much when VFR-on-top as it does in poor viz.)
FFF
----------------