I read an interesting article today on the JEM website about the use of wireless phones in calling 911 in an emergency. In the nutshell, the “less” in “wireless” stands for less effective.
The 911 emergency dispatch system has not kept up with the latest technologies. The explosion in the use of wireless and VOIP system (like Vonage) has left the emergency dispatch system scrambling. The current 911 system in place to incorporate these two growing communication systems is at best a patchwork. I want to first of all address the issues related to wireless phone technologies. In a future post I will address VOIP.
According to the JEM article I mentioned above there are currently two systems for wireless 911 access: network-based and GPS. Network-based systems (like used by AT&T Cingular) use multiple cell phone towers to triangulate your current location. GPS systems use low-orbiting satellites that communicate with the GPS chip in your phone (like used by Verizon Wireless) to determine your location.
Overall network-based systems tend to work better in urban areas that have plentiful cell towers and GPS systems in rural areas. However, both systems have serious weaknesses.
GPS-based Systems
If you are calling indoors with a wireless phone that uses GPS it may be difficult for the satellites to pick up your position. That is why it is best to get close to a window or to step outside when calling 911 on phone using this system. Also, in urban areas the satellite signals can be blocked by buildings and other structures.
Network-based Systems
Network-based systems run into issues in less populated areas that do not have as many cell towers. These systems require a minimum of three towers in order to triangulate your position.
My company offers First Aid & CPR training in North Carolina and surrounding states. I recently conducted some CPR classes in Virginia. My visit there highlighted a huge issue with using cellphones to call 911. What was that you ask? You have to have a signal. At the site where I was, I was dead in the water. Many of the miners that I taught mentioned that this is a big issue there in the mountains. Now, let’s say that you do have a signal, you are still not in the clear. I have had numerous students of ours tell us that they were routed to a 911 dispatch center in a different state when they used their cellphone to call for help. These calls then have to be rerouted and that delay can be critical in an emergency. One of the miners in my recent class did something that I thought was an excellent idea. He programmed in the direct phone number to the local EMS system. So, instead of calling 911 in an emergency he calls EMS directly. I don’t recommend this in general, but in his situation (deep in the mountains) it was probably a smart move.
So, for the foreseeable future, if possible call 911 from a landline phone. If that is not possible, be prepared to give the dispatcher your exact location. Hopefully, future technologies will address these glaring weaknesses in the system.