Kerry.
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Everything posted by Kerry.
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Even travelling several hundred mile with the unit switched off will result in the same thing. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Even travelling several hundred mile with the unit switched off will result in the same thing. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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quote:Originally posted by Geoffrey: One way to do it, is if some people had some money to rent a Survey Grade GPS, to compare with a few consumer model GPS units, in the open and in the woods. Is this an idea? This is one way to see if there are any consumer GPS units that can do Averaging well, or not. No won't really prove much as a survey grade GPS by itself won't really do all that much better. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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quote:Originally posted by Geoffrey: One way to do it, is if some people had some money to rent a Survey Grade GPS, to compare with a few consumer model GPS units, in the open and in the woods. Is this an idea? This is one way to see if there are any consumer GPS units that can do Averaging well, or not. No won't really prove much as a survey grade GPS by itself won't really do all that much better. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Gliderguy, is that a forecast as in the future (like a day in advance) or past tense as per your wording ".. one could see if there was sufficient gps sats visible ..". Basically standard GPS has that type of "forecast" now both what is planned to happen and what did actually happen (on a world wide basis) along with geomagnetic storm type activity but even now the storm stuff is only a prediction. With the current information available and the right software one can "predict" when one should be at a certain place at the right time to "maximize" the benefit. Not that it's really all that critical to the type of GPS stuff that happens here but at times it would take the guess work out of things. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Gliderguy, is that a forecast as in the future (like a day in advance) or past tense as per your wording ".. one could see if there was sufficient gps sats visible ..". Basically standard GPS has that type of "forecast" now both what is planned to happen and what did actually happen (on a world wide basis) along with geomagnetic storm type activity but even now the storm stuff is only a prediction. With the current information available and the right software one can "predict" when one should be at a certain place at the right time to "maximize" the benefit. Not that it's really all that critical to the type of GPS stuff that happens here but at times it would take the guess work out of things. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Markwell, No special drivers but certainly some sort of software. EasyGPS will do it but has some limitation in position formats etc. There's a heap of other software around (some free) that will also do it. Not a lot required in configuring most of the software packages and the receiver also requires to be set for the specific type of comms. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Markwell, No special drivers but certainly some sort of software. EasyGPS will do it but has some limitation in position formats etc. There's a heap of other software around (some free) that will also do it. Not a lot required in configuring most of the software packages and the receiver also requires to be set for the specific type of comms. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Not exactly in line with the original query (same time/different days) but this Time of Day Scenario might shed a litle light Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Not exactly in line with the original query (same time/different days) but this Time of Day Scenario might shed a litle light Cheers, Kerry. I never get lost everybody keeps telling me where to go
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quote:Originally posted by rdw: So the moral of the huge post is that satellite geometry matters. Bad geometry will likely make your readings less accurate. I've seen same poor geometry lately. Only 6 or 7 satellites, most of them towards the south. Less than ideal geometry. Satellite geometry certainly matters but there's a trade off with those horizon sats as they have the most error in them due to more atmospheric influences as the signal scraps throught all that earth atmosphere. Some of the better receivers will have a user definable mask (or maybe a fixed one which is better than nothing) which does exactly that, mask out the low horizon sats. Also the scull cap effect where there are no sats anyway. From 45 deg either sides of the poles up to about 45 degrees. One reason why it's best to face a handheld towards the equator. quote:It would be nice for GPSs to display dilution of presence numbers so you wouldn't have to guess it. It would also be cool to know just how Garmin and Magellan compute their location. I'm sure that's a closely held trade secret though. DOP's would be good but most manufacturers appear to think users won't understand them so they concock up their own version of accuracy and u betchya they aren't about to tell anybody. BTW DOP is "Dilution Of Precision" Cheers, Kerry. I never get lost everybody keeps telling me where to go
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quote:Originally posted by rdw: So the moral of the huge post is that satellite geometry matters. Bad geometry will likely make your readings less accurate. I've seen same poor geometry lately. Only 6 or 7 satellites, most of them towards the south. Less than ideal geometry. Satellite geometry certainly matters but there's a trade off with those horizon sats as they have the most error in them due to more atmospheric influences as the signal scraps throught all that earth atmosphere. Some of the better receivers will have a user definable mask (or maybe a fixed one which is better than nothing) which does exactly that, mask out the low horizon sats. Also the scull cap effect where there are no sats anyway. From 45 deg either sides of the poles up to about 45 degrees. One reason why it's best to face a handheld towards the equator. quote:It would be nice for GPSs to display dilution of presence numbers so you wouldn't have to guess it. It would also be cool to know just how Garmin and Magellan compute their location. I'm sure that's a closely held trade secret though. DOP's would be good but most manufacturers appear to think users won't understand them so they concock up their own version of accuracy and u betchya they aren't about to tell anybody. BTW DOP is "Dilution Of Precision" Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Time of day certainly makes a difference (apart from the 4 odd minute rolling change each day) and if one could "exactly" replicate things from one day to the next then there really wouldn't be that much difference but unfortuneately what occured yesterday (as far as total circumstances/conditions) might never occur again. So many variables to consider. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Time of day certainly makes a difference (apart from the 4 odd minute rolling change each day) and if one could "exactly" replicate things from one day to the next then there really wouldn't be that much difference but unfortuneately what occured yesterday (as far as total circumstances/conditions) might never occur again. So many variables to consider. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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quote:Originally posted by durianwool: Just wondering, doesn't the averaging function induce more errors ever since Clinton turned off Selective Availabity? The averaging function on GPSR's, to my understanding, are to average out the errors caused by SA. With the SA turned off, then I believe it is making a mockery of the averaging algorithm. I tried marking a waypoint with and without the averaging function after SA was turned off 2 years ago, and was surprised to discover that the average one was about 10m off my waypoint as compared to the non-averaged one. Any comments/thoughts? Yes I think averaging was more in tune when SA was on but since then those units with upgradeable software probably have had changes made in recent releases (if one as upgraded the software of course?). Some may still be running pre SA and some post SA software? Averaging can certainly make the position worse (can also make it better ) but the real problem is one doesn't really know. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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quote:Originally posted by durianwool: Just wondering, doesn't the averaging function induce more errors ever since Clinton turned off Selective Availabity? The averaging function on GPSR's, to my understanding, are to average out the errors caused by SA. With the SA turned off, then I believe it is making a mockery of the averaging algorithm. I tried marking a waypoint with and without the averaging function after SA was turned off 2 years ago, and was surprised to discover that the average one was about 10m off my waypoint as compared to the non-averaged one. Any comments/thoughts? Yes I think averaging was more in tune when SA was on but since then those units with upgradeable software probably have had changes made in recent releases (if one as upgraded the software of course?). Some may still be running pre SA and some post SA software? Averaging can certainly make the position worse (can also make it better ) but the real problem is one doesn't really know. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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The difference can be about 3/5th's of 5/8th of .... but if it makes one "feel" better then certainly do it. Currently trying to put together a different angle on averaging and it would appear that after a certain period of time (and fairly short at that) the accuarcy appears to/can go against the purpose. The thing is one doesn't know if it is or not which can make it just a "feel good" excerise. Cheers, Kerry. I never get lost everybody keeps telling me where to go [This message was edited by Kerry on March 09, 2002 at 10:45 PM.]
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The difference can be about 3/5th's of 5/8th of .... but if it makes one "feel" better then certainly do it. Currently trying to put together a different angle on averaging and it would appear that after a certain period of time (and fairly short at that) the accuarcy appears to/can go against the purpose. The thing is one doesn't know if it is or not which can make it just a "feel good" excerise. Cheers, Kerry. I never get lost everybody keeps telling me where to go [This message was edited by Kerry on March 09, 2002 at 10:45 PM.]
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Ok, I think I've sorted out both issues. Thanks for the directions. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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Ok, I think I've sorted out both issues. Thanks for the directions. Cheers, Kerry. I never get lost everybody keeps telling me where to go
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quote:Originally posted by Elias: Some people may have used different usernames on both the geocaching.com site and the forums, so now they'll be represented by their geocaching username. Its possible that you may have been using a username in the previous forums which was already taken by a geocaching account. Unfortunately, if that's so, you'll have to create an account with a different username. -Elias Different usernames on different sites are understandable BUT to COPY one database from one password protected forum to another and have a duplicate user Id basically inherit the posts by default is simply not acceptable, unfortunate or not. I this is the case then out of simple respect I'm requesting the administrators to delete all my previous posts (under my original username) from this forum which were copied over from the old forum (which is now locked). Cheers, Kerry.
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quote:Originally posted by Elias: Some people may have used different usernames on both the geocaching.com site and the forums, so now they'll be represented by their geocaching username. Its possible that you may have been using a username in the previous forums which was already taken by a geocaching account. Unfortunately, if that's so, you'll have to create an account with a different username. -Elias Different usernames on different sites are understandable BUT to COPY one database from one password protected forum to another and have a duplicate user Id basically inherit the posts by default is simply not acceptable, unfortunate or not. I this is the case then out of simple respect I'm requesting the administrators to delete all my previous posts (under my original username) from this forum which were copied over from the old forum (which is now locked). Cheers, Kerry.
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Question regarding the registered usernames between the old forum and the new forum. On this forum trying to login (as per previous username/password) or create a login the same as the previous gives a user already exists/taken error. Now if that is the case (username in fact taken) then I have a query regarding the registered (by password) usernames and associated posts/strings being imported into this new forum and then allowing (if this in fact the case?) others to assume/register that username in this new forum. Maybe this is not the case but there needs to be some clarification of just who is who, now and past? Cheers, Kerry.