[Loadstone] Odd Results

Kevin Chao g.unit89 at clearwire.net
Wed Sep 5 22:56:20 BST 2007


Here is information on the Defense Advance GPS (DAG) Receiver that the 
military uses. The high lights for me were the fact that it can only be 
acquired for use with the government, they are sent back and destroyed after 
use; dual-channel using the L1 and L2 bands; resistant to multi-path and 

 Kevin, article below

The Defense Advanced GPS Receiver (DAGR) is a handheld


 receiver used by the

United States Department of Defense

 and select foreign military services. It is a military-grade, 
dual-frequency receiver, and has the security hardware necessary to decode 
the encrypted


 GPS signal.

Manufactured by

Rockwell Collins

, the DAGR entered production in March 2004, with the 40,000th unit 
delivered in September 2005. It was estimated by the news source Defense 
Industry Daily

that, by the end of 2006, the USA and various allies around the world had 
issued almost $300 million worth of DAGR contracts, and ordered almost 



 It replaced the

Precision Lightweight GPS Receiver

 (PLGR), which was first fielded in 1994.

Due to the


 electronics inside the DAGR, it is against US federal law for any 
individual or organization not authorized by the

National Security Agency

 (NSA) to purchase or be in possession of the device. When devices are no 
longer useful or operational, they are to be returned to an NSA-approved 

(usually the original supplier), where they are destroyed.




list of 14 items

. Graphical screen, with the ability to overlay map images.

. 12-channel continuous satellite tracking for "all-in-view" operation.

. Simultaneous L1/L2 dual frequency GPS signal reception.

. Capable of Direct-Y code acquisition

. Cold start first fix in less than 100 seconds.

. Extended performance in a diverse jamming environment.

list of 2 items nesting level 1

. 41 dB J/S maintaining state 5 tracking.

. 24 dB during initial C/A code acquisition.

list end nesting level 1

. Utilizes

Receiver Autonomous Integrity Monitoring


. Selective Availability/Anti-Spoofing Module

 (SAASM) compatible (currently version 3.2).

. Wide Area GPS Enhancement

 (WAGE) compatible.

. Resistant to multi-path effects.

. Can be used as survey for weapons systems

. Fielded to the Air Force, Army, Marine Corps, Navy and select foreign 
military forces

. Designed to fit in a

Battle Dress Uniform

's 2-clip ammo pouch

. Approximate cost to government per unit to acquire: $1,832


----- Original Message ----- 
From: "Charlie Richardson" <charlieofalbany at hotmail.com>
To: <loadstone at loadstone-gps.com>
Sent: Wednesday, September 05, 2007 2:25 PM
Subject: Re: [Loadstone] Odd Results

> Hi David,
> Just thinking from my experience just standing still and watching the GPS
> drift, you might not get very accurate results marking point 20 to 30 
> meters
> from each other.
> Just stand still sometime and watch your current point change distance, 
> also
> check the altitude and see the same thing.  There's just going to be that
> inherent drift with the GPS receivers we use.
> Out of curiosity I have heard that military grade GPS are more accurate. 
> I
> also know someone who was a surveyor who said they used GPS to do 
> surveying.
> I know they couldn't do that with these GPS receivers, but could a better
> grade GPS work with Loadstone or other GPS solution?  or is it worth the
> money and how much more would they cost anyway.
> ----- Original Message ----- 
> From: "David Greenwood" <DavidGreenwood at rogers.com>
> To: <loadstone at loadstone-gps.com>
> Sent: Wednesday, September 05, 2007 8:22 AM
> Subject: [Loadstone] Odd Results
>>I have just recently started using Loadstone on my Nokia 6682 and enjoying
>> it thoroughly.  I have set some personal points, plus I have downloaded
>> some.  I have encountered this odd situation in both sets of points.  For
>> example, there are three east and west parallel running streets, say A, 
>> B,
>> and C, with Main Street running more or less north and south joining 
>> these
>> streets.
>> Street A 43.7055564, -79.3919018
>> Street B 43.7046435, -79.3916225
>> Street C 43.7037917, -79.3912357
>> There are no problems exploring north and south between Main and A and
>> Main
>> and B, but when exploring between Main and B and Main and C, that's where
>> the interesting things happen.  If I explore north from C, I find B.  If 
>> I
>> explore south from B I find a point twice as far away which definitely is
>> closer to a southerly direction, but since C is 156 degrees from B, I
>> should
>> find C first.  I need to use the 9 key (South-east) to find C from B.
>> This doesn't appear to be intuitive to me, for one thing south-east 
>> should
>> be the range 150 to 120, and the 156 degree direction from B to C lies
>> comfortably in the range of 150 to 210 degrees. The only thing I can 
>> think
>> of is that since the more southerly point, call it point D is very close
>> to
>> being exactly south of point B even though it is three times the distance
>> to
>> point C, there appears to be a bias to closeness of direction over
>> closeness
>> of distance.
>> Where this really messes with me is when I have marked points which are
>> much
>> closer together, say 20 to 30 meters apart, which are my favourite stores
>> along Main Street.  When I navvigate or explore up and down the street
>> many
>> of the points get leap frogged and they are sometimes hard to find.
>> Any thoughts?
>> One more question while I'm here.  as recommended I loaded Y-Browser plus
>> FExplorer on my Nokia 6682, but neither would install.  Loadstone
>> installed
>> like a charm.  What am I doing wrong?
>> David.
>> _______________________________________________
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