Those are the airline identifiesrs of ORLANDO, TAMPA (PIE=FtLauderdae), JAX=JacksonvilleFL, VRB=Vero Beach, MIA-Miami and so on. Most people, having traveled via air recognize their own and destination, but I agree, the others may only be meaningful to other pilots. ORL is Orlando Executive near where I reside but the International 'Orlando' airport is MCO as it used to be McCoy AFB until the city gained control of it.Often, lat/long coordinates are those of near by airports so when you go to your weather page of your local city, you will often be getting the lat/long of a nearby airport serving that city. My MLB (Melbourne) is the regional center around here and MCO and ORL are for Orlando area. DAB, JAX, OCF...these are also about to be affected by Frances.