I have a GPS unit sitting on my desk right now that I could swallow if I put some effort into it. And I&#x27;m pretty sure a good chunk of it is packaging that could be trimmed away if needed, too.<p>The radio equipment needed to transmit the data from the GPS unit is a good point, for sure. But any model aircraft that can&#x27;t carry the weight of a GPS unit itself won&#x27;t pose a threat.