In practice, the iPad locks onto its location far faster than my panel mounted Garmin -even after moving it 100 miles turned off. It is nearly instantaneous and gives you the estimated accuracy as it converges.
I am usually half-way to the runway before the Garmin 195 has made it through its start-up sequence. Thank you Don for your explanation of the inner workings of AGPS.
Angier,
You are incorrect about about the
iPad WiFi + 3G. It does have a GPS chip, that chip has the additional functionality that
Assisted GPS offers. Below is the manufacturer information about the GPS chip that is in an iPad WiFi + 3G.
http://www.broadcom.com/products/GPS/GPS-Silicon-Solutions/BCM4750Don
On Nov 27, 2010, at 2:43 PM, Greenbacks, UnLtd. wrote:
Hi John,
If you have a need to be online at 20k feet, then the iPad with Wi-Fi and G3 could be one way to go. It has an AGPS chip which allows it to derive position through communication with
cell towers only. The G3 model has no dedicated GPS receiver and so is incapable of talking to space vehicles. An iPad with a dedicated external GPS receiver such as
http://bad-elf.com/products/gps/ provides considerably greater accuracy and unlike communicating with ground cell towers, is less likely to lose contact with a satellite.
So my math looks like this 499.00 for the least expensive Wi-Fi iPad plus 99.00 for the Bad Elf GPS receiver (I have one), and you're good to go.
The least expensive G3 model is 629.00 plus your monthly connection charges. How much extra do you pay to connect for 12 months?
Either way, just having every
approach plate in the entire country on your iPad for the 75.00 annual cost of a Foreflight subscription makes it
all worthwhile.
Angier Ames
N4ZQ
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