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Author	Message
skelly76	Post subject: gps error in mexico Posted: Mon Jan 10, 2011 3:43 pm
FlightAware Member Joined: Mon Jan 09, 2006 3:00 pm Posts: 83 Location: near KIXD	i notice that, when using my garmin to track our progress (in a bus) in Yucatan that my GPS showed us off the highway a few miles when in fact we were on it...maybe they dont have good sat reception there? Otherwise the unit worked pretty well, though I also noticed that I couldnt get the city detail like I can here in the conus. My model is the Garmin 250w and it (supposedly) comes with US, Canada, and Mexico.
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drdisque	Post subject: Posted: Mon Jan 10, 2011 6:44 pm
Charter Member Joined: Fri Nov 11, 2005 10:00 pm Posts: 1113	alternatively the map may have had the highway in the wrong location (perhaps it was repaved on an alternate alignment and the map company never figured it out).
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earendil	Post subject: Posted: Mon Feb 07, 2011 6:40 pm
Joined: Wed Apr 22, 2009 8:00 pm Posts: 2	Skelly76, sometimes due to bad satellite geometry in the sky if your GPS is not WAAS enabled, you might be off as far as 20~30 meters, but to be off by a few miles, I would suspect that it might be map problem.
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185Driver	Post subject: Posted: Tue Feb 08, 2011 11:43 pm
FlightAware Member Joined: Mon Nov 13, 2006 2:00 pm Posts: 496 Location: Rockies, western US	I lost gps signal today going into Puebla. Both FMS's went into dead reckoning mode. First time this has happened to me and I have spent a lot of time in places more remote than Mexico. They worked fine going out.
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rw812	Post subject: Posted: Wed Feb 09, 2011 9:39 am
FlightAware Member Joined: Wed Jun 23, 2010 8:00 am Posts: 1581 Location: damiross.net	185Driver wrote: I lost gps signal today going into Puebla. Both FMS's went into dead reckoning mode. First time this has happened to me and I have spent a lot of time in places more remote than Mexico. They worked fine going out. I don't think it has to do with the remoteness of a place. I've been in many remote places where I got great GPS signals. It all has to do with the satellites. Garmin has an article at http://www8.garmin.com/aboutGPS/ about why you received a degraded signal.
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flyboy97222	Post subject: Posted: Wed Feb 09, 2011 11:55 am
FlightAware Member Joined: Tue Jun 19, 2007 8:00 pm Posts: 2656 Location: Sunny South Florida	Shame on you for not checking RAIM
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porterjet	Post subject: Posted: Wed Feb 09, 2011 1:28 pm
FlightAware Member Joined: Tue Jan 17, 2006 12:00 pm Posts: 2387 Location: KSBP/OEJN	GPS, RAIM. Man am I glad we don't have any of that high tech stuff.
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NeedleNose	Post subject: Posted: Wed Feb 09, 2011 1:28 pm
FlightAware Member Joined: Fri Apr 21, 2006 12:00 pm Posts: 3279 Location: KOKV	earendil wrote: I would suspect that it might be map problem. +1 Maps for Mexico are nothing more than basemap detail and are not very accurate. According to some of my GPS tracks in South and Central America, I have walked on water many times!
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flyboy97222	Post subject: Posted: Wed Feb 09, 2011 2:42 pm
FlightAware Member Joined: Tue Jun 19, 2007 8:00 pm Posts: 2656 Location: Sunny South Florida	I was standing on Lincoln St in South Beach. Not on a boat, which would've been much better...
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porterjet	Post subject: Posted: Wed Feb 09, 2011 3:13 pm
FlightAware Member Joined: Tue Jan 17, 2006 12:00 pm Posts: 2387 Location: KSBP/OEJN	If you had a marine map it would have figured it out!
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porterjet	Post subject: Posted: Wed Feb 09, 2011 3:16 pm
FlightAware Member Joined: Tue Jan 17, 2006 12:00 pm Posts: 2387 Location: KSBP/OEJN	On the other hand my maxipad had us right on the taxiway the other night. Kind of cheating since it was using assisted GPS by then.
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NeedleNose	Post subject: Posted: Wed Feb 09, 2011 5:09 pm
FlightAware Member Joined: Fri Apr 21, 2006 12:00 pm Posts: 3279 Location: KOKV	porterjet wrote: ...my maxipad... You use maxi pads??? T.M.I.
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185Driver	Post subject: Posted: Thu Feb 10, 2011 2:22 am
FlightAware Member Joined: Mon Nov 13, 2006 2:00 pm Posts: 496 Location: Rockies, western US	flyboy97222 wrote: Shame on you for not checking RAIM It was beautiful VFR, I was enjoying the view of the Volcanoes, and had it backed up with VHF raw data on the RMI's. Had there been any weather I would have used the ILS anyways & you've shown off your handheld to us before I know you don't have RAIM monitoring or approach capabilities with that.
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flyboy97222	Post subject: Posted: Thu Feb 10, 2011 3:44 pm
FlightAware Member Joined: Tue Jun 19, 2007 8:00 pm Posts: 2656 Location: Sunny South Florida	185Driver wrote: flyboy97222 wrote: Shame on you for not checking RAIM It was beautiful VFR, I was enjoying the view of the Volcanoes, and had it backed up with VHF raw data on the RMI's. Had there been any weather I would have used the ILS anyways & you've shown off your handheld to us before I know you don't have RAIM monitoring or approach capabilities with that. HAHA- we only use that for the XM weather, we have approach capable GPS's on the pedestal. The Problem with the Trimble isn't RAIM it's a matter of RAM...
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