Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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Just browsing through the settings in my tomtom GPS and there are three options i have no clue what they are or how they affect the GPS tracking but the options are
D0 m's"
D0m.m'
D.D0
the 0's are like a degrees symbol?
anyone know
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Tim
Site Administrator
Registered: 21st Apr 00
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Seems like it adjusts how it displays angles?
Degrees - minutes - seconds, Degrees.minutes, etc etc...
Look in the manual? 
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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manual dont say shite about it, what do u think would be best to have it on?
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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i cant seem to find anything on the net either dno if anyone else has been successful
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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anybody work nething out from this?
http://www.satsig.net/lat_long.htm
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3CorsaMeal
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Registered: 11th Apr 02
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yep, its like grid coordinates, expressed in degree's and minutes, personnally i'd choose the D.D0 setting
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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according to that site though d0m's" is the most accurate from what i can make out
[Edited on 21-12-2004 by GSiSteve]
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3CorsaMeal
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Registered: 11th Apr 02
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yeah, but is better as 34.6 imo
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3CorsaMeal
Member
Registered: 11th Apr 02
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looks neater than 34 degrees and 60 minutes
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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ffs i dont care about neatness i want the most accurate
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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i emailed an expert about it this is what he said
"Stephen
If you want to put your location into my calculator at http://www.satsig.net/ssazelm.htm then the appropriate option would be degrees and decimal parts of a degree.
If you use the degree minute second option you have to divide the seconds by 60 add the result to the minutes, divide that result by 60 and add the final amount to the whole degrees - it should give same amswer as above.
If you use deg, minutes and decimal parts of minute then divide the minutes and decimal parts of minute by 60 and add the result to the whole degrees. It should give same result as above.
Unless the degrees and decimal parts of degree option display truncates to just a very few decimal places it is likely that the accuracy of all options is exactly the same - a few metres, which is far better than is required for dish pointing.
Best regards, Eric"
so basically hes saying all methods add up to the same figure, so why have the different types in there in the first place 
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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quote:
Originally posted by GSiSteve
why have the different types in there in the first place
For the same reason that you might say 1:32pm or 13:32:52 or 13:32:52 21-12-2004, they're all the same time, just displayed differently.
Same as its easier to say tell someone you're going to meet them in an hour and a half, not 5523 seconds.
The accuracy is only lost in what you read which for convenience sake it a worthwhile compromise.
[Edited on 21-12-2004 by Ian]
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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i see where your coming from, do u understand ne of that shite he was talking about ian?
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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Didn't read it.
Every date stamp here we store as the number of seconds since Jan 1st 1970, its a standard way of representing things. When they're displayed it doesn't make sense to go for absolute accuracy. If you're involving humans its far easier for them to interpret the figures if they're presented more appropriately.
Sometimes you'll see things like normal dates and you can even convert in to text, like Buddy List will occasionally say 'Just Left' rather than give you a figure which by the time the page has downloaded is wrong.
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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quote:
Originally posted by Eric
it should give same amswer as above
Notice he says this a few times. Its about display, not internal workings.
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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so the same thing could be true of methods of working out a gps location?
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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I'd assume so.
Don't forget, if its using standard NMEA sentences then its getting lat and long in the standard format anyway. I'd be very surprised if its getting different data based on some configuration option.
He's talking about pointing a dish as well, you're talking about pointing a car? You can't need all that much accuracy for the latter.
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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cheers ian  can i come and do sexual things to you in the back of you gsi? we can compare ariel lengths 
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3CorsaMeal
Member
Registered: 11th Apr 02
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told you it was the same thing, so neatness would be the only deciding factor
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Ojc
Member
Registered: 14th Nov 00
Location: Reading: Drives : Clio 197
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Along with the EMA console read out
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3CorsaMeal
Member
Registered: 11th Apr 02
User status: Offline
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i tend to use the SMB mode and sit back and let it do all the work
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Ojc
Member
Registered: 14th Nov 00
Location: Reading: Drives : Clio 197
User status: Offline
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I find with SMB readout the console tends to over read and makes the EMAO data flux from one crossover board to another.
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