What certifications are needed for GPS/GSM devices in AirPort?
1. Factors to consider prior to certification

You will need to first clarify to yourself, and second formally document, each of the following:


the constituent parts in your device (as well as whether the internal parts you might be using themselves have been pre-certified)
whether your devices will be used within just the airport vs. on-board aircraft
any GSM provider(s) you may intend to work with
the target countries/region(s) of operation of the device


2. Regulatory agencies/standards

The following details are provided with a little more weight on United States regulations, but also with some focus on general European regulations. With that said, note that there are a variety of specific regulatory standards to which you need to ensure your device, and its components, conform. In terms of certifications, you'll need to research and get certified by some or all of the following (again, it would depend on the above list of factors for your specific case):


Federal Aviation Administration (FAA) regulations
Federal Communications Commission (FCC) certification
PTCRB (originally: PCS Type Certification Review Board) certification
Carrier certification-testing


3. Obtaining the specifics on applying for the certifications

There is a wealth of information available out there regarding the specifcs of the above, obtainable via the internet or in paper form from the governing bodies of each of the above. Before you head to the websites/phone numbers of the regulatory agencies, I recommend you read the relevant sections of these four documents to get a good start on what is involved:


Certification Overview for the Americas Region
FCC certification for host devices with integrated wireless modules
PTCRB certification for host devices with integrated cellular modules
European certification for host devices with integrated wireless modules


Since the above documents are provided for varying regions, and since the documents are fairly extensive, you can start by funneling down the select requirements for just the first region in which you wish to launch your device.