Db submissions
Other than FCC License checks there is really no way to verify submitted data. As said above I seriously doubt if members submit bad data on purpose. Now I have seen data submitted by others that I question due to the fact they may be hearing a skip or bleedover frequency. When I find submit data its either from official documentation or I have listened and researched for a few days and compared it with the FCC databases for accuracy. If you listen for a few days its ensures the PL, DPL or NAC tone you are hearing is the correct one.