[Openstreetmap] Portable map data collector

[Matt Amos]

On Saturday 02 October 2004 18:29, Petter Reinholdtsen wrote:
> Right.  I just bought myself a GPS.  It is an HAiCOM GPS HI-204E. 
> It support NMEA-0183 v2.20.  A specification is available from
> <URL:http://www.haicom.com.tw/gps204E.htm>.  It is said to support
> WAAS and EGNOS.  I have no idea what that is, but paid some extra
> to get it included. :)

WAAS and EGNOS are methods of improving GPS accuracy by providing 
extra sources of data about atmospheric interference (since they are 
geostationary, or something) which can be subtracted from the GPS 
data to remove one source of noise.

you can allegedly get 1-2 m accuracy using WAAS/EGNOS (WAAS covers the 
USA, EGNOS covers Europe). see more here:
http://gps.faa.gov/Programs/WAAS/waas.htm
http://www.esa.int/export/esaNA/GGG63950NDC_index_0.html

> I'm testing it now.  gpsdrive was able to talk to it, but I don't
> get a position.  It seem to be unable to get signals from enough
> satellites.  But I do see the list of detected satellites changing,
> so I believe the communication is working.

it may take several minutes to lock onto enough satellites to get your 
position. you may find you get better results at different times of 
day, especially in an urban multi-bounce environment.

with me it generally takes about 3 minutes to lock if i'm outside, 
longer if i'm dangling it out of my window ;-)

cya,

matt
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