REFLECTOR: Reflector Digest, Vol 99, Issue 49

David Rene Dugas renedugas at gmail.com
Mon Jun 17 17:25:19 CDT 2013


One subscription gets foreFlight on both. 

Rene' Dugas
Sent from an Apple. 

On Jun 17, 2013, at 1:15 PM, Dave T Nelson <dtnelson at us.ibm.com> wrote:

> As has been stated, WiFi Only ipads do NOT have internal GPS - they use cellular tower triangulation for an approximation of location.  My ipads have internal GPS receivers, and the reported positional accuracy (via ForeFlight) is typically 5 meters... 
> 
> One other point - ALL iphones have internal GPS...
> 
> Thanks.
>   
> Dave
> 
> Dave T. Nelson
> T/L 553-4327, Voice 507-253-4327, Fax 507-253-3648
> Program Director, ISC ECAT NPI & Test Engineering
> 
> ----- Message from Dave Philipsen <velocity at davebiz.com> on Mon, 17 Jun 2013 12:45:28 -0500 -----
> 
> To:
> Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject:
> Re: REFLECTOR: ipad
> I agree.  The cellular radio is not needed to obtain GPS position.  My point is that the iPads that have cellular radios also have true GPS receivers.  It is not to say that the GPS receiver and the cellular radio are one and the same.  It's just that if you buy an iPad that has Wi-Fi only (without a cellular radio) you also will not have a true GPS receiver and thus you will not be able to use it to navigate in an airplane.  I can guarantee you that when you navigated from CA to TX using your iPad that the GPS radio was turned on and functioning regardless of whether the cellular radio was acquiring a signal or not.  If a person with a Wi-Fi only iPad were to try the same thing it would not work because their iPad does not contain a GPS receiver.
> 
> You mentioned that you "think a wireless iPad without cell radio will navigate fine" but then you said that you "drove my V on my iPhone with no cell signal...with no bars on the cellular radio".  So, if your iPad *does* have a cell radio then how do you know that an iPad without a cell radio will navigate fine?
> Dave Philipsen
> Velocity STD FG
> N83DP
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