AGM 66

Submitted: Wednesday, Nov 01, 2006 at 14:25

ThreadID: 39031 Views:4807 Replies:7 FollowUps:7

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Blaze

I have one of the Bush Tracks of Victoria by Ron Moon. This book states it uses AGM 66 datum for all waypoints. I use Oziexporer CE and can not find this Datum listed anywhere in the program. I even checked on my Garmin and it also doesn't have it.

Is there a converter program or is there an easy way to convert these waypoints to WGS 84, which is what all of the people I know use.

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Reply By: Redback - Wednesday, Nov 01, 2006 at 14:35

Wednesday, Nov 01, 2006 at 14:35

It probably hasn't been updated to WGS84, i'm pretty sure ours has 66 in it, i'll check, maybe someone else will let you know in the meantime.

Baz.

AnswerID: 202276

Reply By: davidta - Wednesday, Nov 01, 2006 at 14:39

Wednesday, Nov 01, 2006 at 14:39

Hi,

As far as I know, AGM is the "Americas Global Map", which is still in project mode, not developed yet.
I would suggest that it is a typo & is supposed to be AGD which is the "Australian Geodetic Datum", in this case, of 1966.
I have an old copy of that book somewhere, & there are quite a few mistakes in it.

David

AnswerID: 202278

Reply By: Blaze - Wednesday, Nov 01, 2006 at 14:40

Wednesday, Nov 01, 2006 at 14:40

I was just checking the list. Don't tell me the AGM 66 stands for Australian Geodetic 1966??

AnswerID: 202281

Follow Up By: davidta - Wednesday, Nov 01, 2006 at 14:46

Wednesday, Nov 01, 2006 at 14:46

No, but AGD 66 does.

FollowupID: 461771

Follow Up By: Des Lexic - Wednesday, Nov 01, 2006 at 14:48

Wednesday, Nov 01, 2006 at 14:48

OK I won't tell you then

FollowupID: 461772

Follow Up By: Blaze - Wednesday, Nov 01, 2006 at 14:58

Wednesday, Nov 01, 2006 at 14:58

Thanks David and Des, with a bit more thanks to David LOL

As you will see I sort have worked that out TX, will check tonight by changing to AGD 66 and seeing if it puts me on the Huts etc up in the High Country. 200 meters is a long way out if you are trying to find a Malle Fowl Nest in thick scrub and its also to far out for me when driving tracks etc off road.

FollowupID: 461775

Follow Up By: Blaze - Wednesday, Nov 01, 2006 at 15:00

Wednesday, Nov 01, 2006 at 15:00

Guess I now know why I didn't get a returned email from the author when i asked the question. Didn't want to admit to a typo I guess

FollowupID: 461778

Reply By: davidta - Wednesday, Nov 01, 2006 at 14:42

Wednesday, Nov 01, 2006 at 14:42

Fogot to add, AGD66 is very close to WGS84 (maximum of 200M out) so most people won't need to convert.

David

AnswerID: 202282

Reply By: Robin - Wednesday, Nov 01, 2006 at 15:05

Wednesday, Nov 01, 2006 at 15:05

Hi Blaze

I think you meant to say AMG

Australian map grid 66 and as its typically only out about 90m to the NE I wouldn't worry about it.

Robin Miller

AnswerID: 202284

Follow Up By: Blaze - Wednesday, Nov 01, 2006 at 15:15

Wednesday, Nov 01, 2006 at 15:15

Nope,
His book diffinately says AGM 66, as stated above it could be a typo, but until I now test a couple of different datums I will not know. Not real good if you are walking through scrub 5klm's and the goto point is 90 mtrs out. You could spend an extra hr or 2 finding it, thats after already walking an extra 3mtrs because of the different angle it would send you on.

FollowupID: 461780

Follow Up By: Redback - Wednesday, Nov 01, 2006 at 15:36

Wednesday, Nov 01, 2006 at 15:36

OK, no need to answer i think you get the idea now, i had to get my GPS, for the life of me i couldn't remember the diff.

I should use it more often.

Baz.

FollowupID: 461783

Follow Up By: Robin - Wednesday, Nov 01, 2006 at 19:45

Wednesday, Nov 01, 2006 at 19:45

This is a typical statement seen on government contour maps

AGD datum 1966 , australian map grid zone 55 (AMG)

(from ADA river map in victoria)

Its easy to get'em mixed up.

Its extremely hard to get to an exact point by GPS reference and largely a waste of time if the GPS reference was taken a few years ago before the inbuilt error was removed as this was larger than the 90m or so average error.
So I'd check the source date.

Even today its hard to get within a few meters in scrub espically on non-flat terain

If your in melbourne try this as an exercise.
Get Melways , pick any street junction, write down its coordinates, with GPS set to WGS 84 , try and get to exactly that point.

You might be in for a surprize

Robin Miller

Robin Miller

FollowupID: 461853

Reply By: Member - Toolman (VIC) - Wednesday, Nov 01, 2006 at 18:08

Wednesday, Nov 01, 2006 at 18:08

Blaze,

IMO, If he is writing about AGM66 then I think he means AMG which stands for Australian Map Grid and in that case it could be a typo. That is if he is giving you coordinates in Eastings and Northings as opposed to Latitudes and Longitudes.

If he is giving coordinates in Latitudes and Longitudes. then he is most likely talking about AGD66 which stands for the Australian Geodetic Datum 1966.

To say that AGD66 and WGS84 are close is probably not really correct from a mapping perspective but I guess that depends on what you consider is close. WGS84 and GDA94 are very close (sub metre differences). The difference is that WGS84 and GDA94 are geocentric datums which are specifically intended to be more accurate when using GPS equipment as opposed to AGD66 which is an older datum developed before GPS was available and is not a geocentric based datum. If you type AGD66 coordinates into a GPS that is using either WGS84 or GDA94, you can get errors up to 200 metres but not necessarily everwhere it is not a consistent error.

If you try Googling "convert AGD66 to WGS84" there are converters about . Try the www.ga.gov.au and look there. I suspect that you can also do it in OziExplorer by entering the value in the original datum then changing the configuration to the intended datum but i have to try that to be confident if it can be done and then in how it is done.

Here endeth my spiel. I'll get off my soap box now.
Toolman

AnswerID: 202324