raycluster

This shouldn't be a big deal in flight sim, but im interested in the realworld procedures: Do pilots actually tune in navaids like VORs, when the nav radios are not used otherwise? I saw in the FMC, that if a VOR is tuned in, the computer creates a radio position. If I understood the system correctly, the real 737 doesn't feature a autotune system, unlike the 767 for example, where the FMC automatically triangulates the aircrafts position, if possible. But the 737 has GPS receivers, does this make VOR tuning obsolete? Should I tune the VORs along my path, or is satellite and inertial navigation precise enough? And a related question: Can I get a working map view on the ND, when both IRS and GPS are off? After all, tuning in nearby VOR's should allow the FMC to triangulate my position. I haven't figured out how to use only the radio position when the other systems are failing, though...