basic GPS question for my GPS 72

Submitted: Wednesday, Mar 23, 2005 at 23:30
ThreadID: 21481 Views:3728 Replies:5 FollowUps:4
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I am trying to put some waypoints from a 4WD book i have. Can someone explain the following points to me...

Zone 50J??????

373 142mE 6 521 116mN??????

I'm guessing that the m in the mE and mN is magnetic north and east right? but as far as the coordinates go, i'm tring to put them in my GPS and they appear to be in the wrong format. The choices amongst others in my GPS 72 are;

hddd mm.mmm----------hddd mm ss.s--------hddd.dddd....
which is the correct format to use? What about "north reference" is "true" right or shoud i use "magnetic"??

Which one should i use to be able to enter the above coordinates?

cheers
mike
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Reply By: Brian - Thursday, Mar 24, 2005 at 00:18

Thursday, Mar 24, 2005 at 00:18
Mik is this a point 38km nth of waneroo on the highway ???

These are UTM co-ordnates. what datum do they quote ? WGS84 ???

"hddd mm.mmm----------hddd mm ss.s--------hddd.dddd..." is for Lat long co-ords not utm the setting on garmin for utm should be UTM UPS!

"I'm guessing that the m in the mE and mN is magnetic north and east right?" NO the "m" refers to Meters East and Nth

"What about "north reference" is "true" right or shoud i use "magnetic"??" what ever it makes no difference when it is use in the car.. different when using with map or compasss!!!

Hope this helps
Brian
AnswerID: 103676

Follow Up By: mik*2 - Thursday, Mar 24, 2005 at 00:31

Thursday, Mar 24, 2005 at 00:31
yep, you got the right spot, its actually wilbunga road...going that way on monday for a fish....The datum they say is Australian geodetic 66.

cheers
mike
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FollowupID: 361189

Follow Up By: Brian - Thursday, Mar 24, 2005 at 01:04

Thursday, Mar 24, 2005 at 01:04
Thats great
You will need to put "Aus geod 66" in Map datum to get the exact point!!
Once you have entered the waypoint and entered it then you can change the datum back to WGS84.

Brian
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FollowupID: 361192

Reply By: Davoe - Thursday, Mar 24, 2005 at 02:03

Thursday, Mar 24, 2005 at 02:03
usually the pionts you get for gps are in hddd mm mmm or utm ups which is what you are describing. 250k or 100k have both with utm ups being the easiest to use coz they corrospoind with the grid on the map. Sounds like you know little about it would really pay for you to get good personell info as it is quite important for you to get the most out of your gps and it is too late and too many beers for me to explain but for starters go to utm ups in set up and all will be revealled
AnswerID: 103677

Reply By: mik*2 - Thursday, Mar 24, 2005 at 10:14

Thursday, Mar 24, 2005 at 10:14
I changed to UTM was able to put those points in.
No, i don't know much about that part of it so i will be doing some research on the net to learn and then i'll be OK.

cheers
mike
AnswerID: 103692

Follow Up By: Mad Dog (Australia) - Thursday, Mar 24, 2005 at 10:37

Thursday, Mar 24, 2005 at 10:37
Have a look here Mike

http://www.maptools.com/UsingUTM/
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FollowupID: 361220

Reply By: mik*2 - Thursday, Mar 24, 2005 at 10:49

Thursday, Mar 24, 2005 at 10:49
thanks for that mad dog...

cheers
AnswerID: 103698

Reply By: drogger - Thursday, Mar 24, 2005 at 11:29

Thursday, Mar 24, 2005 at 11:29
Hi Mike

Sone 50 and Eastings, Northings refer to the UTM system of co-ordinates. It is an attempt to represent co-ordinates on a "flat" model and has many advantages when dealing with points that are realtively "close" (such as 6 degrees of arc). The biggest advantage is that co-ordinates can be specified down to metre resolution.

I personally prefer UTM and use it exclusively. But it doesn't matter with GPS anyway - because you can input UTM and get Lats/Longs out and visa versa quite easily.

For more information I suggest you look at the following websites:
http://www.maptools.com/UsingUTM/quickUTM.html
and
http://www.dmap.co.uk/utmworld.htm

Cheers
Jeff
Bunbury Western Australia
AnswerID: 103700

Follow Up By: mik*2 - Thursday, Mar 24, 2005 at 21:59

Thursday, Mar 24, 2005 at 21:59
Thanks for that, the manual doesnt explain any of this so that is why i asked the question.

I've got some reading to do!

Thanks for the help....

cheers
mike
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FollowupID: 361296

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