Each company has its own frequencies. The HSAC frequency card lists these. There is a common frequency for use when there is a need to talk to a helicopter from another company, but it's not used that often, and nobody monitors it. We have no idea whatsoever what other helicopters flying for other operators may be in the area, or indeed anywhere. The present system makes no sense, but the majors are concerned about smaller operators using their resources, and thus nobody is willing to go to a common flight-following system. It's every man for himself out there, and the flight following ranges from very good to non-existant. There is not, and is not likely to be, any common flight-following frequencies in the GOM unless the FAA does it, and the chances of that are in the lower quartile of the range between slim and none.