For C129 must have alternate nav available for IFR.
• No overlay of LOC, LDA or SDF approaches. (Monitoring only)
Other overlays must be in the database to fly them with the GPS.
• A non-GPS approach procedure must exist at the alternate airport when one is required. If the non-GPS approaches on which the pilot must rely require DME or ADF, the aircraft must be equipped with DME or ADF avionics as appropriate.
You may not want to junk your DME and/or ADF!