|Guess we can always get a ...shudder... map|
Physorg.com recently cited two Garmin engineers who tested for interference between 4G transmitters and GPS receivers. They found that:
"The [handheld] GPS began to experience interference when 5.8 km or closer to the simulated transmitter and lost the fix altogether when 1.1 km away. Interference started at 22.1 km for the aviation receiver, and total loss of fix occurred at 9.0 km from the transmitter."The U.S. Air Force has also expressed concern over likely GPS disruption, but is optimistic about working with 4G infrastructure provider LightSquared to remedy the issue.
|GPS deadzones might prove a bigger problem for planes, which|
rely on GPS to determine speed. And to navigate through
clouds and across oceans! Not to mention ships...
Lightsquared Spokesperson Jeff Carlisle said that the 4G base stations are not at fault. Instead, he explained that some GPS units can 'see into' adjacent frequencies, including the one which Lightsquared uses.