Kerry.

About as accurate as the base data that it was derived from, which can be variable, very variable. In general GPS is much better than the methods probably used originally to collect the base map data. The other thing is maps are generally designed to be used at a particular scale so attempting to zoom in on maps not intended to be zoomed in is not all that useful. Cheers, Kerry. I never get lost everybody keeps telling me where to go

About as accurate as the base data that it was derived from, which can be variable, very variable. In general GPS is much better than the methods probably used originally to collect the base map data. The other thing is maps are generally designed to be used at a particular scale so attempting to zoom in on maps not intended to be zoomed in is not all that useful. Cheers, Kerry. I never get lost everybody keeps telling me where to go

The DoD has always and will always have control of the GPS and that's nothing new and the best way anyway. By the very nature of Selective Availability (which is still there but simply set to zero) being on or off certainly has a direct affect on the displayed EPE. Because how SA works/worked and being individually unique to each satellite the EPE is based (apart from a few other things) on the data being received and since that data creates a greater circle of error since the measured ranges are directly affected in a random way the determined/displayed error will definately change also. Selective Deniability is a little different again. WAAS has a "Military Emergency Mode" which is invoked at the prerogative of the US Air Force. Similar with any systems like DGPS in dire circumstances they would loose functionality as well. Cheers, Kerry. I never get lost everybody keeps telling me where to go

The DoD has always and will always have control of the GPS and that's nothing new and the best way anyway. By the very nature of Selective Availability (which is still there but simply set to zero) being on or off certainly has a direct affect on the displayed EPE. Because how SA works/worked and being individually unique to each satellite the EPE is based (apart from a few other things) on the data being received and since that data creates a greater circle of error since the measured ranges are directly affected in a random way the determined/displayed error will definately change also. Selective Deniability is a little different again. WAAS has a "Military Emergency Mode" which is invoked at the prerogative of the US Air Force. Similar with any systems like DGPS in dire circumstances they would loose functionality as well. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Averaging by its very nature does just that gives one an average, doesn't necessarily mean we know more accurately where we are but. So many variables there's about a 50% chance of having more confidence in the result and about 50% of having less confidence. What one doesn't know at the time is which 50% one is dealing in. Averaging has more to do with confidence in the result more so than accuracy as averaging can actually decrease accuracy. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Averaging by its very nature does just that gives one an average, doesn't necessarily mean we know more accurately where we are but. So many variables there's about a 50% chance of having more confidence in the result and about 50% of having less confidence. What one doesn't know at the time is which 50% one is dealing in. Averaging has more to do with confidence in the result more so than accuracy as averaging can actually decrease accuracy. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by M&M Speedracers:....so I should let that run for a few minutes and what exactly will that do for my coordinates? Will it change them, if necessary, to a more exact set of coordinates, or will I have to manually do that in some way? The Averaging function will change the displayed coordinates and the values stored will be the values at the moment you decide to save them (after whatever period of time you let the average run). Will they be more exact, Yes, No, could be, might be then maybe not as there's about a 50/50 chance of inceasing or decreasing the actual accuracy. Averaging can actually decrease the accuracy and without a reference point it's really something one doesn't know for sure. As for averaging poor coverage, bad geometry (in other words bad data anyway) then the result will generally be a bad average as well. One thing that improves accuraccy is planning to be at a specific location (and all things considered) to take advantage of the best possible conditions. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by M&M Speedracers:....so I should let that run for a few minutes and what exactly will that do for my coordinates? Will it change them, if necessary, to a more exact set of coordinates, or will I have to manually do that in some way? The Averaging function will change the displayed coordinates and the values stored will be the values at the moment you decide to save them (after whatever period of time you let the average run). Will they be more exact, Yes, No, could be, might be then maybe not as there's about a 50/50 chance of inceasing or decreasing the actual accuracy. Averaging can actually decrease the accuracy and without a reference point it's really something one doesn't know for sure. As for averaging poor coverage, bad geometry (in other words bad data anyway) then the result will generally be a bad average as well. One thing that improves accuraccy is planning to be at a specific location (and all things considered) to take advantage of the best possible conditions. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Input whatever format in the right format then change to whatever format preference and one won't have a problem but mix things up and one could be half a mile out. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Input whatever format in the right format then change to whatever format preference and one won't have a problem but mix things up and one could be half a mile out. Cheers, Kerry. I never get lost everybody keeps telling me where to go

There's no good reason to reboot. Actually I collected some data from a unit last week which I first turned on in 1997, it's been running/recording 24 hours a day ever since without problem. The only thing it's worn out is one UPS and 2 external backup disk packs. Cheers, Kerry. I never get lost everybody keeps telling me where to go

There's no good reason to reboot. Actually I collected some data from a unit last week which I first turned on in 1997, it's been running/recording 24 hours a day ever since without problem. The only thing it's worn out is one UPS and 2 external backup disk packs. Cheers, Kerry. I never get lost everybody keeps telling me where to go

As far as accuracy one really has to split hairs to even worry about the difference. There is/will be some difference under different conditions but again it can be purely academic considering the accuracy of the system specifications anyway. Accuarcy and Precision are basically 2 differnet things and besides none of the 45 series gave much (if anything) away in displayed precision v accuarcy compared to anything comparable today in a 12 channel. The following is a 5 v 12 channel comparision but as far as pure accuracy goes there's really nothing that most users would even notice in accuracy between a 8 & 12 channel Garmin. http://www.cqnet.com.au/~user/aitken/gps/gps_5v12.htm One advantage the 45 series had over other handhelds of the era was the antenna type/design, which even by some of todays handhelds is still a better design. Cheers, Kerry. I never get lost everybody keeps telling me where to go

As far as accuracy one really has to split hairs to even worry about the difference. There is/will be some difference under different conditions but again it can be purely academic considering the accuracy of the system specifications anyway. Accuarcy and Precision are basically 2 differnet things and besides none of the 45 series gave much (if anything) away in displayed precision v accuarcy compared to anything comparable today in a 12 channel. The following is a 5 v 12 channel comparision but as far as pure accuracy goes there's really nothing that most users would even notice in accuracy between a 8 & 12 channel Garmin. http://www.cqnet.com.au/~user/aitken/gps/gps_5v12.htm One advantage the 45 series had over other handhelds of the era was the antenna type/design, which even by some of todays handhelds is still a better design. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by crr003:So, is GPS time and UTC time the same (it seems to be from the later posts)??? No, GPS time and UTC time are not the same (now) but differ by the appropriate number of leap seconds as adopted from time to time. The leap second correction can increase or decrease but to this point in time it has always been on the increase (world is slowing down). Basically GPS time was set equal to UTC time when the GPS system was born (5/6 Jan, 1980) but effectively the earth is slowing down which has changed/affected UTC time but GPS time has remained fixed. The current difference is 13 seconds and this leap second value is transmitted as part of the nav message so that GPS time can be corrected to current UTC time from which we can apply a zone correction to get our local time. That 12.5 minutes is roughly the time it takes to transmit a full almanac in which things like the leap second correction and all that sort of stuff is contained. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by crr003:So, is GPS time and UTC time the same (it seems to be from the later posts)??? No, GPS time and UTC time are not the same (now) but differ by the appropriate number of leap seconds as adopted from time to time. The leap second correction can increase or decrease but to this point in time it has always been on the increase (world is slowing down). Basically GPS time was set equal to UTC time when the GPS system was born (5/6 Jan, 1980) but effectively the earth is slowing down which has changed/affected UTC time but GPS time has remained fixed. The current difference is 13 seconds and this leap second value is transmitted as part of the nav message so that GPS time can be corrected to current UTC time from which we can apply a zone correction to get our local time. That 12.5 minutes is roughly the time it takes to transmit a full almanac in which things like the leap second correction and all that sort of stuff is contained. Cheers, Kerry. I never get lost everybody keeps telling me where to go

I suppose the nice thing about software fixes is "things" can be fixed and I suppose if "things" don't sound right next week then lets have another go. Cynical I know but there's really no consistency to EPE type stuff if last week it was that and this week is can be this . Cheers, Kerry. I never get lost everybody keeps telling me where to go

I suppose the nice thing about software fixes is "things" can be fixed and I suppose if "things" don't sound right next week then lets have another go. Cynical I know but there's really no consistency to EPE type stuff if last week it was that and this week is can be this . Cheers, Kerry. I never get lost everybody keeps telling me where to go

that's as spot on as the reciever precision will allow . Cheers, Kerry. I never get lost everybody keeps telling me where to go

that's as spot on as the reciever precision will allow . Cheers, Kerry. I never get lost everybody keeps telling me where to go

EPE's (or equivalents) generally appear not to report the highs and lows (that's what I've observed/recorded anyway) and has everything to do with how the EPE is programmed/derived but that information is propriety so we're really not sure what it means. However it's regardless of the accuracy specifications stated in the manual. The proper accuracy specification (world wide average) is less than 13m (~42 feet) 95% of the time which is signal-in-space figures and doesn't take into account of where the user is trying to operate the GPSr. That 15m is generally a bit outdated now but also the important "bit" is the type of accuarcy that 15m is, CEP, RMS, 95% etc as figures alone can be a bit deceptive. Cheers, Kerry. I never get lost everybody keeps telling me where to go

EPE's (or equivalents) generally appear not to report the highs and lows (that's what I've observed/recorded anyway) and has everything to do with how the EPE is programmed/derived but that information is propriety so we're really not sure what it means. However it's regardless of the accuracy specifications stated in the manual. The proper accuracy specification (world wide average) is less than 13m (~42 feet) 95% of the time which is signal-in-space figures and doesn't take into account of where the user is trying to operate the GPSr. That 15m is generally a bit outdated now but also the important "bit" is the type of accuarcy that 15m is, CEP, RMS, 95% etc as figures alone can be a bit deceptive. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by 4249Nawth:Why so accurate on the first pass? That's what they call Statistics (coincidence) and many things affect those statistics. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by 4249Nawth:Why so accurate on the first pass? That's what they call Statistics (coincidence) and many things affect those statistics. Cheers, Kerry. I never get lost everybody keeps telling me where to go

About 110' Cheers, Kerry. I never get lost everybody keeps telling me where to go