[Loadstone] Direction change

Kerry and Gemma Hoath kerryandgemma at gotss.net
Sun Dec 14 01:56:01 GMT 2008

Your point regarding geostationary orbit is well taken.
No I did not read the wikipedia article before I posted; although I have 
read it in the past, there is a lot of good information in there.

Regarding the animation; sadly no use to me as I am totally blind. Guess 
Gemma could take a look if she had a mind to.

When I speak of a differential source I refer to a stationary ground-based 
source of information that can be used to augment and offset the gps data. 
gpsd seems to support this somehow; and there are servers on the internet 
that can provide aditional data to assist in accuracy.
This is not something loadstone will likely use as that would require an 
internet connection and if loadstone was going to do that it might as well 
use assisted gps on the newer phones.

Loadstone does not use or require a net connection; which is one of the 
reasons I chose it over wayfinder access or other products.
Mobile data is not cheap in Australia yet.

Regards, Kerry.

----- Original Message ----- 
From: "Robert (Jamie) Munro" <rjmunro at arjam.net>
To: <loadstone at loadstone-gps.com>
Sent: Sunday, December 14, 2008 10:19 AM
Subject: Re: [Loadstone] Direction change

> Hash: SHA1
> Kerry and Gemma Hoath wrote:
>> [lots of correct stuff about GPS and direction]
>> It would be well to remember you are using a series of satelites in
>> geostationary orbit to track your location;
> Minor point this, but a common misunderstanding:
> The satellites are not in geostationary orbit - they are much closer to
> the earth than that, and they do not follow the equator, they are in 6
> rings 60 degrees apart around the equator at an angle of 55 degrees from
> the equator. There's a great explanation and animation here:
> http://en.wikipedia.org/wiki/Global_Positioning_System#System_detail
> If you switch on WAAS or EGNOS on your reciever, you use signals from a
> single additional satellite which is in geostationary orbit.
>> and not a differential source.
>> If you had a ground-based differential source and the ability to use it;
>> you'd be able to potentially get far more responsive direction 
>> information.
> I'm not sure what you mean by "differential source" and why GPS
> satellites don't count as one. Do you mean directional?
> I've heard that some GPS units include a magnetic compass which can tell
> which way the unit is pointing without it moving. If you want fast
> updates of which direction you are facing, it may be worth investing in
> one of those, but I'm not sure if loadstone supports them.
> Robert (Jamie) Munro
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