Holux 236 does support EGNOS/WAAS

Alanb7777 · Posted: Tue May 10, 2005 2:49 pm Post subject: Holux 236 does support EGNOS/WAAS

There has been some discussion concerning support for EGNOS/WAAS support on SiRF STAR III based systems (Globalsat 338 does not). I just received a copy of the Holux GPSlim236 spec sheet and User's Guide. They both specify that the 236 does support EGNOS/WAAS. Under "Position" it states:

Non DGPS (Differential GPS):
-position: 5 - 25 m CEP without SA

EGNOS/WAAS/Beacon
-position <2.2 m, horizontal 95% of time
<5 m, vertical 95% of time

The User's Guide is dated 031705

lbendlin · Posted: Tue May 10, 2005 5:47 pm Post subject:

Have you tried to get a WAAS fix yet?
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Alanb7777 · Posted: Wed May 11, 2005 12:39 am Post subject:

No, I do not have the unit as of this time. I was able to download the spec sheet and User's Manual last night.

lbendlin · Posted: Wed May 11, 2005 1:13 am Post subject:

well, then let's prove that theory in real life, right?
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DataMan · Posted: Wed Jun 22, 2005 12:50 am Post subject:

lbendlin · Posted: Wed Jun 22, 2005 2:56 am Post subject:

WAAS (Wide Area Augmentation System) consists of two geostationary satellites (one each over the oceans adjacent to the Americas) that act as pseudo GPS satellites, and that can help compensate the adverse effects of the ionosphere on the signal runtime of the standard satellites. With this correction the receiver can increase the position accuracy to 3 meters (from 25 without WAAS). But the receiver must be capable to receive these (weaker) signals, and it must actually see those two birds (or at least one of them) - not very likely in the northern parts, or in urban area/dense foliage.

For road navigation WAAS is generally not required. 25 meters is good enough.

In Europe the system is called EGNOS, can't remember the name in Asia.
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DataMan · Posted: Wed Jun 22, 2005 4:22 am Post subject:

lbendlin · Posted: Wed Jun 22, 2005 4:43 am Post subject:

New York is actually pretty close to one of the birds so you may get lucky and see one every now and then. But for street navigation in the city it's certainly not required. The multi path feature of SiRF III is way more important in urban canyons. Do you see a lot of position jumps?
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DataMan · Posted: Wed Jun 22, 2005 4:55 am Post subject:

lbendlin · Posted: Wed Jun 22, 2005 4:58 am Post subject:

most definitely. It's a huge improvement over SiRF II
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DataMan · Posted: Wed Jun 22, 2005 5:12 am Post subject:

lbendlin · Posted: Wed Jun 22, 2005 5:47 am Post subject:

scroll back up to the start of the topic...
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DataMan · Posted: Wed Jun 22, 2005 5:55 am Post subject:

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