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Date: Sat, 27 Nov 2010 15:43:33 -0500
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From: "Greenbacks, UnLtd." <N4ZQ@VERIZON.NET>
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Subject: Re: iPad GPS
References: <1BBBCD5E-CFA7-4894-96B6-748900AAD373@verizon.net>
 <1A6589D6-69E8-4E62-9C68-0589DB662C28@comcast.net>

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


On Nov 27, 2010, at 12:14 AM, John Hafen wrote:

> Tell me how I get a moving map display, with present position,  
> altitude, airspeed, etc., at 20,000 feet, far away from cell towers.
>
> You can argue whatever you want but it works.  Is it GPS or AGPS, or  
> who gives a damn?  I don't care if it is pixie dust.  It works, and  
> corresponds exactly to the present position on my Cheltons.
>
> You can tell me all day long I don't have a GPS receiver.  You may  
> even be technically right.  But I get moving map capability at 20k  
> feet.
>
> So you tell me:  If there is no GPS chip in the iPad, how do I get  
> moving map display at 20k feet?
>
>
> On Nov 25, 2010, at 9:42 AM, Greenbacks, UnLtd. wrote:
>
>> Hi John,
>>
>> You said...I DO have an iPad with an internal GPS receiver, from  
>> the factory.  So would I be buying myself anything with another  
>> external receiver?  better reception?  more accuracy?...
>>
>> What specific model do you have with an 'internal GPS receiver'?  
>> Can you see the number and strength of space vehicle signals? Where  
>> on your iPad is the GPS antenna located?
>>
>> Angier Ames
>> N4ZQ
>>
>