Travel Tech: How Your iPhone’s A-GPS Works in the Wilderness
The 3G and 3GS versions of the iPhone have dedicated GPS chips in them. They use a technology called assisted GPS to help locate you in the world. The assisted part comes from using a Wi-fi or cellular radio signal to triangulate your general position. Then, when the GPS chip gets a good satellite fix, it will take over and give you a more specific location. Your phone looks for a Wi-Fi or cell signal first and then switches over to the GPS, if it does not find either of these.—Keene Haywood
A-GPS allows you to get a decent location fix quickly, while the GPS signal gives you accuracy. So when you are off in the wild, you can still get location information with your phone’s GPS chip, but it just might take a little longer to initially get a fix. The original 2G iPhone unfortunately does not have a GPS chip. Users are left to navigate with only Wi-Fi or cell signal triangulation, which is less accurate. iPod Touch users can use location apps, too, but are also relegated to the 2G iPhone’s location technology. Read about top iPhone mapping apps >>
Quick Tip: For those shooting with cameras and don't have a GPS with them, whip out your iPhone and take a picture which will geocode the image and can then be used as a location reference later when you get home and want to geocode your images. Your iPhone photos will be embedded with location coordinates, which most photo management software can read, such as Apple’s iPhoto or the new Aperture 3 which has a feature for using iPhone pics in just this way.
Related Topics
Go Further
Animals
- How can we protect grizzlies from their biggest threat—trains?How can we protect grizzlies from their biggest threat—trains?
- This ‘saber-toothed’ salmon wasn’t quite what we thoughtThis ‘saber-toothed’ salmon wasn’t quite what we thought
- Why this rhino-zebra friendship makes perfect senseWhy this rhino-zebra friendship makes perfect sense
- When did bioluminescence evolve? It’s older than we thought.When did bioluminescence evolve? It’s older than we thought.
- Soy, skim … spider. Are any of these technically milk?Soy, skim … spider. Are any of these technically milk?
Environment
- Are the Great Lakes the key to solving America’s emissions conundrum?Are the Great Lakes the key to solving America’s emissions conundrum?
- The world’s historic sites face climate change. Can Petra lead the way?The world’s historic sites face climate change. Can Petra lead the way?
- This pristine piece of the Amazon shows nature’s resilienceThis pristine piece of the Amazon shows nature’s resilience
- Listen to 30 years of climate change transformed into haunting musicListen to 30 years of climate change transformed into haunting music
History & Culture
- Meet the original members of the tortured poets departmentMeet the original members of the tortured poets department
- Séances at the White House? Why these first ladies turned to the occultSéances at the White House? Why these first ladies turned to the occult
- Gambling is everywhere now. When is that a problem?Gambling is everywhere now. When is that a problem?
- Beauty is pain—at least it was in 17th-century SpainBeauty is pain—at least it was in 17th-century Spain
Science
- Here's how astronomers found one of the rarest phenomenons in spaceHere's how astronomers found one of the rarest phenomenons in space
- Not an extrovert or introvert? There’s a word for that.Not an extrovert or introvert? There’s a word for that.
- NASA has a plan to clean up space junk—but is going green enough?NASA has a plan to clean up space junk—but is going green enough?
- Soy, skim … spider. Are any of these technically milk?Soy, skim … spider. Are any of these technically milk?
Travel
- Could Mexico's Chepe Express be the ultimate slow rail adventure?Could Mexico's Chepe Express be the ultimate slow rail adventure?
- What it's like to hike the Camino del Mayab in MexicoWhat it's like to hike the Camino del Mayab in Mexico