Kerry.

quote:Originally posted by SkydiverBC: Well if we are going to get picky... it's HDD(D)° MM.MMM Hemisphere, degrees, minutes, and decimal minutes. Picky, no that's not picky, this is picky HDD(D)° MM.MMM" Ya forgot the minutes symbol ", very important in making a written coordinate unambiguous . Cheers, Kerry. I never get lost everybody keeps telling me where to go

Really depends on what one is using it for as different users have different requirements and since GPS is a global utility all users need to be catered for. It might be nice to think there could be a single format but on a global basis it probably a very big ask. Even on a local country basis the different requirements exist for all types of things from land to marine to weather to survey to search and rescue to aircraft and all the other uses in between. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Really depends on what one is using it for as different users have different requirements and since GPS is a global utility all users need to be catered for. It might be nice to think there could be a single format but on a global basis it probably a very big ask. Even on a local country basis the different requirements exist for all types of things from land to marine to weather to survey to search and rescue to aircraft and all the other uses in between. Cheers, Kerry. I never get lost everybody keeps telling me where to go

There's nothing one can do with NMEA data as far as converting to Rinex as in NMEA all the processing has been done and the variables/data required to process aren't available. The Magellan will output NMEA as will almost all other GPS receivers but the raw data output from "some" Garmin reeivers is something Garmin don't confirm (but they don't deny it either). Cheers, Kerry. I never get lost everybody keeps telling me where to go

There's nothing one can do with NMEA data as far as converting to Rinex as in NMEA all the processing has been done and the variables/data required to process aren't available. The Magellan will output NMEA as will almost all other GPS receivers but the raw data output from "some" Garmin reeivers is something Garmin don't confirm (but they don't deny it either). Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by CountryLover: Not sure 'cos I think the satellites are supposed to be geostationary or something ? . . . What I've noticed is I get different signal levels from the satellites at different times and days from exactly the same spot. Only difference is cloud cover which can be extensive here which I notice DOES make a noticable difference. NO affect from the cloud but all the satellites are in fact moving (about 4000m/second) and not geo-stationary, so at different times of the day one will generally be seeing combinations of different satellites, in different relative locations and signal strengths will certainly vary as individual satellites "rise and set". Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by CountryLover: Not sure 'cos I think the satellites are supposed to be geostationary or something ? . . . What I've noticed is I get different signal levels from the satellites at different times and days from exactly the same spot. Only difference is cloud cover which can be extensive here which I notice DOES make a noticable difference. NO affect from the cloud but all the satellites are in fact moving (about 4000m/second) and not geo-stationary, so at different times of the day one will generally be seeing combinations of different satellites, in different relative locations and signal strengths will certainly vary as individual satellites "rise and set". Cheers, Kerry. I never get lost everybody keeps telling me where to go

Sounds like an issue with your GPS and/or the environment you are using it. On the system side there shouldn't be any issues with signal strength at all. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Sounds like an issue with your GPS and/or the environment you are using it. On the system side there shouldn't be any issues with signal strength at all. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Solar activity (sun spot, solar flares etc) can as does geomagnetic storm activity etc but is also dependent on scale and is continuously monitored with different types of warnings as appropriate. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Solar activity (sun spot, solar flares etc) can as does geomagnetic storm activity etc but is also dependent on scale and is continuously monitored with different types of warnings as appropriate. Cheers, Kerry. I never get lost everybody keeps telling me where to go

The full name "NAVSTAR GPS" says it all, NAVigation Satellite Timing And Ranging Global Positioning System. The "Timing" bit almost controls the world. Cheers, Kerry. I never get lost everybody keeps telling me where to go

The full name "NAVSTAR GPS" says it all, NAVigation Satellite Timing And Ranging Global Positioning System. The "Timing" bit almost controls the world. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Accuracy (real accuracy) is something that is very hard to simply notice but simply having an unobstructed antenna is generally always going to be an improvement (of some sort) but dependent on a few other issues. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Accuracy (real accuracy) is something that is very hard to simply notice but simply having an unobstructed antenna is generally always going to be an improvement (of some sort) but dependent on a few other issues. Cheers, Kerry. I never get lost everybody keeps telling me where to go

A tool? the GPS is the tool. Cheers, Kerry. I never get lost everybody keeps telling me where to go

A tool? the GPS is the tool. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by harrkev: That's OK, because supposedly the GPS time is off by 13 seconds from the real time in any case (unless the GPS firmware accounts for this 13 seconds). Not only supposedly but fact, for the moment anyway until the next leap second adjustment is made (when ever that might be decided?) GPS time has not changed since the system was born on the 5/6 Jan 1980 as the world is slowing down but all is taken care of in the Nav message to correct for "our" time. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by harrkev: That's OK, because supposedly the GPS time is off by 13 seconds from the real time in any case (unless the GPS firmware accounts for this 13 seconds). Not only supposedly but fact, for the moment anyway until the next leap second adjustment is made (when ever that might be decided?) GPS time has not changed since the system was born on the 5/6 Jan 1980 as the world is slowing down but all is taken care of in the Nav message to correct for "our" time. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by denali: My GPSIII has a waypoint averaging funtion which continuously takes readings until I tell it to stop. Does this take anything else into consideration other than the individual lat/lons? Extremely difficult (basically impossible) to obtain the underlying principles behind Garmin's EPE, FOM etc but it would be a fair assumption the the computation of each set of coordinates has already taken into account geometry and other associated factors. Similar with the averaging method it's difficult to "exactly" know what's going on in the background but I doubt it takes into account anything else but each set of coordinates? Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by denali: My GPSIII has a waypoint averaging funtion which continuously takes readings until I tell it to stop. Does this take anything else into consideration other than the individual lat/lons? Extremely difficult (basically impossible) to obtain the underlying principles behind Garmin's EPE, FOM etc but it would be a fair assumption the the computation of each set of coordinates has already taken into account geometry and other associated factors. Similar with the averaging method it's difficult to "exactly" know what's going on in the background but I doubt it takes into account anything else but each set of coordinates? Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by BrianSnat: .... My question is, which method do you think is the most accurate. The actual average, or the most frequent occurring number? Really neither as it's probably about 50/50. 50% chance of making it better and 50% chance of making it worse. Cheers, Kerry. I never get lost everybody keeps telling me where to go

quote:Originally posted by BrianSnat: .... My question is, which method do you think is the most accurate. The actual average, or the most frequent occurring number? Really neither as it's probably about 50/50. 50% chance of making it better and 50% chance of making it worse. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Since the discussion is about averaging (and assumably improving accuracy) why would anybody prefer a GPS-V over say a GPS76 or a GPS12 or a 48 or a .... As far as polarization of antenna's goes, if either is not used correctly they are both going to be as bad as each other. Cheers, Kerry. I never get lost everybody keeps telling me where to go

Since the discussion is about averaging (and assumably improving accuracy) why would anybody prefer a GPS-V over say a GPS76 or a GPS12 or a 48 or a .... As far as polarization of antenna's goes, if either is not used correctly they are both going to be as bad as each other. Cheers, Kerry. I never get lost everybody keeps telling me where to go