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  #1  
Old 12-12-2008, 10:27 AM
zumka (Daniel)
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GPS Software

Hi Guys,


Is there GPS software I can use with my laptop and USB GPS to identify my latitude, longitude and elevation


Thanks
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Old 12-12-2008, 10:43 AM
robgreaves
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Yes, buy a GPS 'mouse' USB GPS device, and they generally come free with a CD with basic test programs on there that spit out your lat/long and the correct time.

If not, there are plenty of free progs on the web to do this. I have a Rikaline GPS mouse and that came with a free program to do that. It's also downloadable free from their website.

It basically just converts NMEA out data to lat/long.

Regards,
Rob
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Old 13-12-2008, 01:49 AM
TambourineMan (Chet)
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Some cell phones now come with an internal GPS and there are some free services available here 9with a data connection plan) in the US (Google maps and Live Search) that work with them to show your location (and traffic and other stuff). I am not sure whether they provide a latitude and longitude, but it may be worth checking what's available in Australia.

I use a program for my Pocket PPC by iGuidance (iNav) that does show the latitude and longitude.
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Old 13-12-2008, 08:16 AM
zumka (Daniel)
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I'm after pc program since I'll be using my eepc to drive the mount. I can connect my USB mouse to get long and lat accurately
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  #5  
Old 15-12-2008, 09:12 AM
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bmitchell82 (Brendan)
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google seems to get it pretty accurate. just zoom in on the location your viewing from. but hey toys and gadgets a man cant be seen without them!
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Old 19-12-2008, 06:09 PM
WhiteStarLine (Bill)
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Find location from USB GPS Data

Hi Daniel,

Not sure from your post whether you want to do this frequently (ie you move the scope) or just once, to know your location. If once, as others have said, just use Google Maps (click on Link and it embeds your location as a lat lon). For example, in http://maps.google.com/?ie=UTF8&ll=-...ACT,+Australia you can see Canberra is 35 degrees S and 149 E.

If you want to move your scope and EEPC to different locations and all you want to do is quickly find an accurate lat / long and GPS height, then your Asus has what you need already. No software install required.

A GPS outputs what are called NMEA sentences and these have lat / lon / height etc built in already (no conversion required). If you have a Windows XP Asus, HyperTerm is all you need. Connect to your USB com port and read the incoming raw data. With my USB GPS I set HyperTerm to com3 and 57,600 baud, but each one is slightly different. Now, look for the sentence starting $GPGGA. This has the UTC time, latitude, N or S indicator, longitude, E or W indicator and a number of other data items, all comma separated. No 9 is the height (NB height above the WGS-84 ellipsoid, not height above mean sea level), while 10 is whether this is in metres or feet. For Linux, just use PuTTY.

I suspect you're better off with a utility so here's an updated list of totally free (and legal) GPS software from a reputable source:

http://www.maps-gps-info.com/fgpfw.html

Post any questions.
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  #7  
Old 05-04-2010, 03:42 PM
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glenc (Glen)
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Your GPS tells you your ellipsoid WGS84 altitude.
"GPS does not report the height above the mean sea level, rather the GPS system compares the height to the WGS84 reference ellipsoid which may be above or below the actual sea level. In different parts of the earth it can be off by more than 200 meters (depending on the mass distribution of Earth). For example the geoid's surface around Florida is above the mean sea level by a good 30-40 meters, which means that standing on the shore would show you -30m as altitude. This is normal, and not an error, and caused by the fact that the altitude is relative to an artificial reference surface and not to the sea level. If you are interested in this topic, I recommend to read this http://www.esri.com/news/arcuser/0703/geoid1of3.html

To find your true altitude above sea level go to this website. http://www.ga.gov.au/geodesy/ausgeoid/nvalcomp.jsp
N is the difference between your sea level altitude and the WGS84 altitude. (take N off the GPS altitude in NE Australia)
In Brisbane take 41.5m off. In Perth add 32.5m.
This map shows N values http://www.esri.com/news/arcuser/070.../geoid3_lg.jpg
If you have an Android phone this GPS status program is handy http://eclipsim.com/gpsstatus/

Last edited by glenc; 05-04-2010 at 04:15 PM.
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  #8  
Old 06-04-2010, 02:48 AM
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glenc (Glen)
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Here is some more information on the geoid and altitude variations.
http://en.wikipedia.org/wiki/Geoid
http://upload.wikimedia.org/wikipedi...t_red_blue.png
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