GPS co-ordinates - try looking 5 foot further north

Copy and Paste worked for me Rod.

Anyway, I have done as you could have and inserted the link below.

The Insider article

Sorry Rod, didn't see a link box, didn't know I needed to use one.
Normally use a different platform.

Thanks Bill, for supplying the required link in the required format. I will try and remember for future :)

snip " I can usually see where to go when driving "

Made me think of the story about the bloke who drove in to a lake "because the navigation unit said 'continue straight on for 500m' "

Some mothers do have 'em hehehehe

That's not the end of it Pop.

The Vernal Equinox takes about 25770 years to make one complete cycle - you must take this into account.

What about the obliquity of the ecliptic compared to the rotational axis of the earth. Currently it's about 23.439° but varies plus or minus over about 41000 years - you must take this into account.

Then you have the perihelion of the Earth's orbit completing one cycle every 21000 years (Anomalistic Year) - definitely take this into account.

The eccentricity of the Earth's orbit varies over a period of 100000 years - dont forget that in any calculations.

lol, just joking - don't worry about it!!!

Hey this is all important stuff that has to be taken into account when we are trying to determine just where we are.

In addition to the above we must also take into our GPS calculations that our solar system is not stationary. Our sun and planets are orbiting a point in our galactic center. Some rather clever individual, or more likely group of individuals, has worked out that our little star and it's associated group of planets takes something like 225,000,000 years, travelling at 792,000 kl/hr to complete one revolution relative to the aforementioned center of our galaxy.
Now add to that, the fact that relative to a term of reference called the CBR or cosmic background radiation and using a Doppler method, it appears that our whole barred spiral galaxy is travelling through the intergalactic void at 210,000,000 kl/hr (give or take) and heading towards an area of the observable universe known as the "Great Attractor".

Tell ta what mate, it ain't just all this galactic stuff that's spinning. My head is starting to hurt just thinking about where we really are and where we might wind up. Although even at that great rate of knots the journey is going to take quite a few "are we there yets" to complete. (;=))

Cheers
Pop

Hi

Theoretically all coordinates recorded in the past will be out by varying amounts (depending how long ago they were recorded) as Australia has moved northwards (and still is)...

..however given the difference between the new datum and the old ones (WGS84/GDA94) is only a few metres you won't notice the difference (for your average 4WD activity). If you are are concerned just take two steps to the north and you'll be in the right spot :)

The creation of the new datum is more aimed at people such as surveyors etc who need good accuracy.

Cheers
Greg

LG, are you for real? They are shifting the co-ords by 1.8 metres but as The Bantam said:

"So they have revised the datum ...... nothing new, no big deal they do this from time to time....... the resolution of the typical domestic GPS ... is claimed as 7.8 meters with 95% certainty in good conditions."

As your navigator is lucky to locate you within 7.8 meters why are you worried about the new maps being 1.8 metres out?

Hey PeterD
I'm always 'for real' mate. Don't have time to mess about being any thing but...

My original post did mention needing to move '5 foot to the North' due to the Earths movement. I am aware the GPS units can't pinpoint your EXACT location.

What caught my attention the most was the revamping next year, and the introduction of an entire new system in 2020 (assuming I understood the article correctly)

Sorry if my question caused you any angst. I will return to sitting quietly in the corner saying nothing to nobody.

There has already been a thread on this LG.

No there is no plan for an entirely new system in 2020, GA has simply decided to use the projected numbers for that year as of Jan 2017. It will take a few years before the plate movement catches up to the numbers being used - assuming similar rates of continental plate shift over the next few years of course. If however Trump gets elected in the good old USA there may need to be an immediate and drastic review.

Geoscience Australia notification of datum shift

No new system at all? That will teach me for believing something I saw in an online news article :)

"After 2020, a new system will take over and it will continually adjust with the shifts in the plates over time. We used the old plate fixed system to make life simple, but we don’t want to do this adjustment every so often,” Dan Jaksa of Geoscience Australia told the BBC.
“Once we have a system that can deal with changes over time, then everybody in the world could be on that same system.”

Sorry. I thought you were suggesting an entirely new co-ordinate system, not a change to the way adjustments are done to the datum.
Here's the background to the new arrangements:
Australian Datum Modernisation
Note the FAQs at the bottom

Thanks for the link Bazooka.
I will take a stroll through the info after the weekend :)

Algorithm isn't a bad attempt, but I don't think you are allowed to post in this thread if anyone can understand any of the words you are typing....

Allan, are you trying to start another WW3 12 volt thread?

I think you're just a mischief maker :-)

.
Qui moi?