oh yeah, that was the day the ET ship flew by and caused a temporal wave disturbance, just wait til the conspiracists get hold of this.... ----- Original Message ----- From: "Jim" To: Sent: Tuesday, November 19, 2002 8:46 PM Subject: Re: [OT]: (Report of) GPS anomalies > - - - - - - - - - - - - - - - - - - > > Short description of the event: > > On 7-mar-98 between 21:11:57 and 21:31:46 I noticed GPS anomalies that > I've never seen before. These anomalies resulted in position errors in > latitude, longitude and altitude up to 600 meters. I have data to support > the event in the form of track and waypoint files recorded by pcx5 > downloaded after the event from a Garmin 45. I'm interested whether the > event was local because of RFI or global because of a GPS problem. > > Long description of the event: > > The event started around 21:11:57 GMT where the G45 displayed the message > "power down and re-init" which according to the manual refers to a > situation where the GPS 45 is not able to calculate a position due to > abnormal satellite conditions. The manual suggests to turn the unit off > and to verify the last position by other means. > > I did this several times and it didn't help. I tried several modes (normal > and autolocate), in both cases the GPS 45 reinitialized itself, appeared > to be running for a minute or so and came back with the same messages. > Eventually I ran a self diagnostics test (enter/on simultaneously). The GPS > 45 did not appear to complain about anything abnormal during the > diagnostics. > At 21:31:46 things went back to normal and the receiver operated as usual. > > The track file that I've downloaded from the receiver (0710398.trk) shows > errorneous position readings from a car on the interstate between Antwerpen > and Breda. The North to South track along that interstate was recorded in > the morning where everything seemed to be ok which I can tell because > I've driven this part many times. Earlier I've recorded waypoints which are > stored in the file 0710398.wpt. The morning track ran nicely through the > waypoints. > > The evening track goes South to North along the same interstate. For most > part you can see that the tracks run parallel. This is not anymore the case > near the locations where the receiver started to display the "power down > and re-init" messages. There is evidence for this between 21:11:57 and > 21:18:02 GMT and also between 21:24:16 GMT and 21:24:29 GMT. > > - - - - - - - - - - - - - - - > > More at: > > Report: > http://pocus.geo.tudelft.nl/~schrama/Public/gps/g45/anomaly.txt > > Track file: > http://pocus.geo.tudelft.nl/~schrama/Public/gps/g45/0710398.trk > > RF Jim > > ----- Original Message ----- > From: "Chris Loiacono" > To: > Sent: Tuesday, November 19, 2002 3:38 PM > Subject: Re: [OT] While on the subject of GPS... > > > > Does the error of a standard GPS receiver affect it's ability to determine > a > > vehicle's or vessel's speed accurately, or is it safe to assume that the > > error will be constant and the speed it reports will be accurate? > > > > TIA, > > Chris > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.