The below is the mmessage that I wrote to the BrailleNote list regarding this GPS Drift. John, I would recommend sending all questions relating to the Sendero GPS to the GPS-Talks Users list, which can be found at: http://www.senderogroup.com/ I will go ahead and answer your question regarding marking a User POI and having it drift a substantial distance. This is known as, "GPS Drift." The reason this occurs is because the satellites that the GPS receiver are picking up are in outer space and the signals have a good distance to travel before it can determine your GPS position and send the information to your GPS receiver, which can bbe several thousand of miles away. During which time, the signals have many things to bounce off creating this drift, which you noticed. With newer receivers, the drift can be less significant as compared to older receivers. This drift can be +/-30 feet under normal conditions. I would recommend reading the Accuracy document found on your CompactFlash card or in the 42docs.zip at MySendero.com as well as the User Guide to have a full indept understanding of this great Orientation tool along with the mapping/GPS quirks, which you experienced with the drift of your User POI. Kevin User of the Sendero GPS for two years -----Original Message----- From: braillenote-bounces@xxxxxxxxxxxxxxxxxx [mailto:braillenote-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of John Harden Sent: Friday, December 28, 2007 2:19 PM To: BrailleNote List Subject: [Braillenote] Sendero GPS this is a strange thing. When I am standing still and creat a usert point of interest I am told that the point that I just created is somewhere else. Fore instance, I am told that the point that I just created is 25 feet south. If I haven't moved why is the point somewhere away from where I am? ___ Replies to this message will go directly to the sender. If your reply would be useful to the list, please send a copy to the list as well. To leave the BrailleNote list, send a blank message to braillenote-unsubscribe@xxxxxxxxxxxxxxxxxx To view the list archives or change your preferences, visit http://list.humanware.com/mailman/listinfo/braillenote -----Original Message----- From: gps-talkusers-bounce@xxxxxxxxxxxxx [mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Raul A. Gallegos Sent: Saturday, December 29, 2007 10:57 PM To: gps-talkusers@xxxxxxxxxxxxx Subject: [gps-talkusers] Re: Greetings and a question Welcome to GPS drift. When you set a POI with any GPS program, this is normal because of many factors including, but not limited to; drift, signal bouncing, coordinates, ETC. john Harden wrote: > Greetings, I am John Harden in Daytona Beach Florida. I purchased a used > mPower QT 18 with Sendero GPS. I have version 4.02 and the Holux GPSLIM236 reciever. > > Now, this is a strange thing. When I am standing still and create a > usert point of interest I am told that the point that I just > created is somewhere else. Fore instance, I am told that the > point that I just created is 25 feet south. If I haven't moved > why is the point somewhere away from where I am? > > I have marked all the gates at our bus transfer station. While standing at > gate N3 the GPS announced gates S4 and S7. S4 is not too far away but S7 is probably 200 feet down the platform and on the other side. This project is probably not going to be very helpful. Any help will be appreciated. > > John > -- Raul A. Gallegos .. GW Micro Technical Support Voice: 260-489-3671 .. Fax: 260-489-2608 WEB: http://www.gwmicro.com FTP: ftp.gwmicro.com