Inertial Navigation or Gryocompass Modules?

Does anyone have any suggestions on an inertial navigation/sensor module for an indoor navigation system? Most of the systems and
information I've been able to find are for combined GPS/INS systems. GPS is not an option, and I've already tried using a magnetic compass (and failed miserably, there's too many other magnetic fields in Pitt's engineering building for them to work). I had planned initially on using dead reckoning, so a gyrocompass could work, if I could find one. Anyone have any suggestions on something that will work, and be relativly cheap?
Thanks, Mike Delaney
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Mike Delaney wrote:

Not sure how cheap you mean but you might want to check this out for $300:
http://rotomotion.com/prd_REV2.4.6DOFK.html
I got one recently, but have not had time to put it together yet.
Jerry -- -------------------------------------------------------------------- -- Jerry Petrey - Senior Principal Systems Engineer -- Navigation (GPS/INS), Guidance, & Control -- Raytheon Missile Systems - Member Team Ada & Team Forth -- NOTE: please remove <NOSPAM> in email address to reply --------------------------------------------------------------------
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