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wrongturn
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Joined: Feb 17, 2008
Posts: 13
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 Posted: Wed Feb 27, 2008 6:38 pm Post subject: lat and long |
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hi after my success at loading poi.s onto my tt one xl eu thanks to darrens dumpty guide i would like to ask how long and lat points are entered on it Latitude : (Nord) 49.7635° Décimaux ou 49° 45′ 48.6′′
Longitude :(Est) 000.3650° Décimaux ou 000° 21′ 54′′
which of the above is correct to use and what is the difference thanks in advance |
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Oldboy
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Joined: Dec 08, 2004
Posts: 10644
Location: Suffolk, UK
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| Posted: Wed Feb 27, 2008 6:59 pm Post subject: |
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If you mean how are lat/long entered on the Device, it depends on how you have set your Preferences in Set Units. It can be Decimal Degrees (d.d), Degrees and Decimal Minutes (d m.m) or Degrees Minutes Seconds (d m s).
If you mean in a POI then it is always in Decimal Degree Format, with Longitude, Latitude, Name.
West, and South, are denoted by Minus Degrees.
There is no difference in the Value, only in the User Interface of the Value.
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Richard
TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1145 |
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geesss
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Joined: Feb 29, 2008
Posts: 18
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| Posted: Fri Feb 29, 2008 8:40 am Post subject: |
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| no difference? |
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Oldboy
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Joined: Dec 08, 2004
Posts: 10644
Location: Suffolk, UK
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| Posted: Fri Feb 29, 2008 10:24 am Post subject: |
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| geesss wrote: | | no difference? |
| Quote: | Longitude :(Est) 000.3650° Décimaux ou 000° 21′ 54′′
which of the above is correct to use and what is the difference thanks in advance |
Longitude 000.3650 (Decimal Degrees) is the same as 000 21' 54" (Degrees Minutes Seconds).
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Richard
TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1145 |
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DennisN
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Joined: Feb 27, 2006
Posts: 14907
Location: Keynsham
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| Posted: Fri Feb 29, 2008 10:28 am Post subject: |
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| geesss wrote: | | no difference? |
Correct - as in "Six of one, half a dozen of the other" (no difference in the value, nine is either treble three or three squared, some of us understand either way - not me, I hasten to add, I'm too thick for all that stuff!!).
The Decimal way is one way of giving Lat/Long, the Degrees and decimal Minutes way is another and Degrees Mins Secs is yet another. Different way of presenting the details, but they both result in the same dot (value) on the map.
Why on earth am I trying to comment here? I haven't the faintest idea how any of them work, I simply pick up the figures from my TomTom and they work - thank God for the smart spider inside! Now, give me a cross reference from an Ordnance map and I'll find the place unerringly, but Lat/Long, forget it! (And please don't anybody try to explain it to me - pearls amongst swine where I'm concerned).
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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Andy_P
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Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Fri Feb 29, 2008 11:42 am Post subject: |
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In other words, YOU don't have to be clever enough to do the maths to convert from one method to another, just set up the preferences in the TomTom to use the layout you want to enter.
If you DO want to know more, there's a co-ordinate convertor website HERE
For the Latitude/Longitude section of THAT website, it says (when you expand it by clicking on the header), "You can enter decimals under any of the above boxes,
to cope with DDD.DDDDD° or DDD° MM.MMM'
or DDD° MM' SS.S" type coordinates." |
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DennisN
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| Posted: Fri Feb 29, 2008 11:44 am Post subject: |
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 Oink, Oink!
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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Andy_P
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Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Fri Feb 29, 2008 12:05 pm Post subject: |
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Just for Dennis...
There's 360 degrees in a circle... (and therefore in the compass).
Each degree can be divided up into tenths, hundredths and thousandths.... giving the 51.508333 format.
In a different way of thinking, each degree can be divided up into 60 "minutes" and each "minute" can be divided up into 60 "seconds"...
giving the 51° 30' 30'' format.
And just to make things difficult, someone came up with a sort of mix of the two ways of thinking; using degrees, minutes and tenths of minutes...
giving the 51° 30.500' format.
Where it all goes pear-shaped is when it gets written down badly, especially when people can't find or remember the right symbols on their computers!
But I'm sure he knows all about it really! |
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DennisN
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| Posted: Fri Feb 29, 2008 12:49 pm Post subject: |
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'Course I do, Oink, Oink. Easy Peasy. So, in other words for the less continent among us, when I'm at 46.38721, I'm at about eight and a half minutes past. But whilst on my keyboard I have a couple of blobs like this ; and a couple like this : and a couple like this " and a couple like this =, I can't find one like this º. That's dead annoying! 
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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wrongturn
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Joined: Feb 17, 2008
Posts: 13
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| Posted: Fri Feb 29, 2008 1:39 pm Post subject: |
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| thanks guys its all perfectly clear now, no really i do undrstand it now |
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Fri Feb 29, 2008 4:33 pm Post subject: |
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| Andy_P2002 wrote: | Just for Dennis...
There's 360 degrees in a circle... (and therefore in the compass).
Each degree can be divided up into tenths, hundredths and thousandths.... giving the 51.508333 format. |
Except that your example gives an accuracy to within one millionth of a degree or about 4.3776 inches of latitude. (I have approximated one deg Lat = 60 nm (By olde worlde definition) and 1 nautical mile = 6080 feet) (and I have stuck to imperial as Lat don't work too well in km). I suspect this is rather more accurate than the average GPS can measure your actual position. 
Oh! and a compass is a thingy with two legs witha spikey thingy at the end of one leg and a pencilly thingy at the end of the other. Damn fine device for drawing circular compass roses  |
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DennisN
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Joined: Feb 27, 2006
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Location: Keynsham
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| Posted: Fri Feb 29, 2008 6:35 pm Post subject: |
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| M8TJT wrote: | | Andy_P2002 wrote: | Just for Dennis...
There's 360 degrees in a circle... (and therefore in the compass).
Each degree can be divided up into tenths, hundredths and thousandths.... giving the 51.508333 format. |
Except that your example gives an accuracy to within one millionth of a degree or about 4.3776 inches of latitude. (I have approximated one deg Lat = 60 nm (By olde worlde definition) and 1 nautical mile = 6080 feet) (and I have stuck to imperial as Lat don't work too well in km). I suspect this is rather more accurate than the average GPS can measure your actual position.
Oh! and a compass is a thingy with two legs witha spikey thingy at the end of one leg and a pencilly thingy at the end of the other. Damn fine device for drawing circular compass roses |
Don't worry!! I already knew all that and wrongturn has clearly sussed it out now. All's well that lives in glass houses full of moss stitchers.
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Fri Feb 29, 2008 7:29 pm Post subject: |
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| DennisN wrote: | | All's well that lives in glass houses full of moss stitchers. |
Uh  |
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DennisN
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Joined: Feb 27, 2006
Posts: 14907
Location: Keynsham
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| Posted: Fri Feb 29, 2008 10:50 pm Post subject: |
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| M8TJT wrote: | | DennisN wrote: | | All's well that lives in glass houses full of moss stitchers. |
Uh |
Listen very carefully - I will say ziss only once (more) mon brave ...
All's well zat lives in glass 'ouses full of moss stitchers.
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Sat Mar 01, 2008 7:11 pm Post subject: |
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| M8TJT wrote: |
Except that your example gives an accuracy to within one millionth of a degree or about 4.3776 inches of latitude. |
Well it's better than the Camera submission map that goes to 14 decimals! I started off just using random numbers, but then thought people would complain that 51.12345º deg didn't equal 51º 30' 30" or whatever, so used a co-ordinates conversion site (http://www.nearby.org.uk) and just copy and pasted.
| Quote: |
a compass is a thingy with two legs witha spikey thingy at the end of one leg and a pencilly thingy at the end of the other. Damn fine device for drawing circular compass roses |
So what's the thing I take out walking then? I didn't draw it!  |
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