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Having looked briefly at the websites you mentioned, the Fortuna uses a
SirfStar IILP chip and the Globalsat uses a SirfStar III chip. Now if
you look at the specs The Globalstar with WAAS activate is accurate to
4 meters vs 10 for the Forutna. The Globalsat is also a 20 channel GPS
vs. 12 for the Fortuna. Finally the Globalsat mentions being EGNOS
ready and the Fortuna only mentions WAAS.<br>
<br>
To me it all indicated the Globalsat is a more accurate unit. Now the
Fortuna has features the Globalsat does not have.<br>
<br>
<br>
I once compared a Garmin 60CS (non Sirfstar) a Garmin 60CSx (Sirfstar
III) and the difference in locations, holding each unit in one hand was
in the last digits of the UTM reading, meaning a difference in single
meters.<br>
<br>
<br>
<br>
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<title>73 de K9CHP Amir Findling</title>
<ul>
<li>73 de K9CHP Amir Findling, Member ARRL, WAC</li>
<li><a href="http://www.k9chp.net">www.K9CHP.net</a></li>
<li>Senior K9 Handler, Cayuga County Highland SAR</li>
<li>K9 Certification Tester, NYS Federation of SAR Teams</li>
<li>1st Special Response Group (1SRG)</li>
</ul>
</div>
<br>
<br>
Phillip wrote:
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<div>Hi Stephen,</div>
<div> The GPSmart is manually set to
WGS84 and the Globalsat is default WGS84</div>
<div>Both are SIRF powered both give the same amount of error I
am wondering if there is an error in the chipset .</div>
<div> </div>
<div><a moz-do-not-send="true"
href="http://www.fortuna.com.tw/gpsmart.htm">http://www.fortuna.com.tw/gpsmart.htm</a>
GPSmart</div>
<div> </div>
<div><a moz-do-not-send="true"
href="http://www.globalsat.com.tw/eng/product_detail_00000044.htm">http://www.globalsat.com.tw/eng/product_detail_00000044.htm</a>
Globalsat BU-353</div>
<div> </div>
<div>73 Phillip</div>
<div>ZL2TZE</div>
<div> </div>
<div>----------------------------------------------------------------------------------------------------</div>
<div> </div>
<div>Message: 14</div>
<div>Date: Wed, 02 Apr 2008 02:05:47 -0700</div>
<div>From: "Stephen H. Smith" <<a moz-do-not-send="true"
href="mailto:wa8lmf2@aol.com">wa8lmf2@aol.com</a>></div>
<div>Subject: Re: [aprssig] GPS off track</div>
<div>To: TAPR APRS Mailing List <<a moz-do-not-send="true"
href="mailto:aprssig@lists.tapr.org">aprssig@lists.tapr.org</a>></div>
<div>Message-ID: <<a moz-do-not-send="true"
href="mailto:47F34C6B.9060206@aol.com">47F34C6B.9060206@aol.com</a>></div>
<div>Content-Type: text/plain; charset=ISO-8859-1; format=flowed</div>
<div> </div>
<div>Phillip wrote:</div>
<div>> Hi,</div>
<div>> Have am using a Toshiba Laptop Satellite
2140CDS, AGW engine,,</div>
<div>> UI-View</div>
<div>> 32, and a DRSI TNC2 as my mobile tracker</div>
<div>></div>
<div>> I have 2 New GPS units a GPSmart 12 channel and new
today a Globalsat</div>
<div>> BU-353 SIRF powerd both of them</div>
<div>></div>
<div>> Both these GPs give me an error of 55 mtrs East and
30 North in</div>
<div>> Google when</div>
<div>> checking with <a moz-do-not-send="true"
href="http://www.aprs.if">www.aprs.if</a> and <a
moz-do-not-send="true" href="http://www.findu.com">www.findu.com</a></div>
<div>></div>
<div>> I did a track tonight (02/04/08 NZT) zl2tze-15
with the new BU-353 it</div>
<div>> has me not packed at my correct address.</div>
<div>></div>
<div>> On Saturday ( 29/03/08) I travelled to Nelson using
the GPSmart GPS</div>
<div>> this</div>
<div>> also has the same error.</div>
<div>></div>
<div>> Is this a GPS , UI-View , an error in the Google
maps or is it that</div>
<div>> these</div>
<div>> cheaper GPS units are not the great ???</div>
<div>></div>
<div>> My correct address is zl2tze-4 on the Maps Google</div>
<div>> Any help on this will be appreciated</div>
<div>> 73 Phillip</div>
<div>> ZL2TZE</div>
<div>></div>
<div>></div>
<div>></div>
<div> </div>
<div>What datum are the GPS units set for? If they are not
set to WGS84</div>
<div>(WORLD Geodetic System 1984) mode, you will see hundreds
of feet error.</div>
<div> </div>
<div>This is a constant issue in the U.K. where many paper and
electronic</div>
<div>maps use the British Ordinance Survey datum rather than
the WGS84 datum</div>
<div>that is native and default on most GPS devices. Google
Maps (used by</div>
<div>both findu and aprs.fi) are aligned with the world-wide
GPS-inspired</div>
<div>WGS84 datum. Many British APRS users set their GPS
units to use the</div>
<div>UK ordinance datum to make posits line up on their own
maps; only to</div>
<div>see major errors when they view themselves on Findu or
aprs.fi.</div>
<div>I would guess that Australia and New Zealand may also
suffer from this</div>
<div>problem of a "local" datum in use rather than the
world-wide WGS84.</div>
<div>(The Brits established numerous local datums during the
centuries of the</div>
<div>British Empire in places all over the world.)</div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div>--</div>
<div> </div>
<div>Stephen H. Smith wa8lmf (at) aol.com</div>
<div>EchoLink Node: 14400 [Think bottom of the 2M band]</div>
<div>Home Page: <a moz-do-not-send="true"
href="http://wa8lmf.com">http://wa8lmf.com</a> --OR-- <a
moz-do-not-send="true" href="http://wa8lmf.net">http://wa8lmf.net</a></div>
<div> </div>
<div>NEW! World Digipeater Map</div>
<div> <a moz-do-not-send="true"
href="http://wa8lmf.net/APRSmaps">http://wa8lmf.net/APRSmaps</a></div>
<div> </div>
<div>JavAPRS Filter Port 14580 Guide</div>
<div> <a moz-do-not-send="true"
href="http://wa8lmf.net/aprs/JAVaprsFilters.htm">http://wa8lmf.net/aprs/JAVaprsFilters.htm</a></div>
<div> </div>
<div>"APRS 101" Explanation of APRS Path Selection &
Digipeating</div>
<div> <a moz-do-not-send="true"
href="http://wa8lmf.net/DigiPaths">http://wa8lmf.net/DigiPaths</a></div>
<div> </div>
<div>Updated "Rev H" APRS <a moz-do-not-send="true"
href="http://wa8lmf.net/aprs">http://wa8lmf.net/aprs</a></div>
<div>Symbols Set for UI-View,</div>
<div>UIpoint and APRSplus:</div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
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