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Post by Joey on Aug 12, 2021 12:58:49 GMT 10
Found this video which might help those who are wanting to learn a bit about map and compass navigation.
Now this is an American video so the GM angle conversions are opposite for us here in the Southern Hemisphere.
For Australia the calculation rules are as follows:
MGA (My Great Arse) Magnetic to Grid ADD
GMS (Grand Ma Sucks) Grid to Magnetic SUBTRACT
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spatial
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Post by spatial on Aug 12, 2021 18:07:16 GMT 10
I work almost daily with with maps - mostly making maps. It is very surprising how many people struggle with paper maps. It is even worse now that most have GPS talk through to get to an area. Having a scale ruler and protractor & pencils is a good idea for bugout bag. Having a hand held GPS or app on your phone is very useful. See link below on how to use your iphone compass which has built in magnetic sensors and link your location to a map. Knowing how to put a track and waypoints into you GPS is a required critical skill. www.dummies.com/consumer-electronics/smartphones/iphone/how-to-use-the-iphone-compass-and-level/ |
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Tri-Polar
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Post by Tri-Polar on Aug 12, 2021 18:17:37 GMT 10
Saving this one for later.
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Post by Joey on Aug 13, 2021 7:33:13 GMT 10
I work almost daily with with maps - mostly making maps. It is very surprising how many people struggle with paper maps. It is even worse now that most have GPS talk through to get to an area. Having a scale ruler and protractor & pencils is a good idea for bugout bag. Yes, gone are the days of flipping through the UBD that was stored under the seat of the car to find an address. |
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Post by spinifex on Aug 13, 2021 8:58:27 GMT 10
I work almost daily with with maps - mostly making maps. It is very surprising how many people struggle with paper maps. It is even worse now that most have GPS talk through to get to an area. Having a scale ruler and protractor & pencils is a good idea for bugout bag. Having a hand held GPS or app on your phone is very useful. See link below on how to use your iphone compass which has built in magnetic sensors and link your location to a map. Knowing how to put a track and waypoints into you GPS is a required critical skill. www.dummies.com/consumer-electronics/smartphones/iphone/how-to-use-the-iphone-compass-and-level/IMO you cant beat paper maps for non-urban areas. Coated to be waterproof. They never run out of batteries, cant glitch up, are EMP proof and can handle being wet or dropped. They can even serve as a bit of rainproof sheeting. I like to add in extra points of interest/usefulness as I find them. Bee hives, stock water points, places that provide a good shelter, unmarked tracks etc |
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Beno
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Post by Beno on Aug 13, 2021 10:48:11 GMT 10
Paper maps are gold i used to study my local maps for hours finding new places to check out. I think they are no longer being made and have gone to digital copies. Hopefully they can still be printed and be high quality.
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Post by Joey on Aug 13, 2021 11:44:25 GMT 10
Where or how do you waterproof the maps?
I keep Hema maps in vacsealed bags in my car for all of Central and Northern Qld in my small car survival type kit (which is just signal, maps, compass, fire starting and a good old Hootchie)
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Post by Joey on Aug 13, 2021 12:16:09 GMT 10
Found another useful video on navigation, again this is a US video so the conversions will be opposite like my original post above.
This is on "Resection" or "Triangulation" which is useful when you get lost geographically embarrassed to find your current position.
You might not have man-made structures in your area to take bearing off so you might have to use natural features and interpret them on the map, such as distinct hill formations or water bodies.
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spatial
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Post by spatial on Aug 13, 2021 12:26:45 GMT 10
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spatial
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Post by spatial on Aug 13, 2021 12:42:01 GMT 10
Where or how do you waterproof the maps? I keep Hema maps in vacsealed bags in my car for all of Central and Northern Qld in my small car survival type kit (which is just signal, maps, compass, fire starting and a good old Hootchie) 30 years ago doing geological exploration used to put maps in plastic sleeve while using them in the field, especially aerial photographs. One can draw and make notes on the plastic sleeve overlay which was good. I would try the self adhesive laminate covers that school children use. $5 at Wollies.. www.woolworths.com.au/shop/productdetails/660419?produp=1884182486&cq_src=GOOGLE&cq_cmp=Woolies_8458_BAU_Shopping_Smart_Others_WW-0001&cq_con=All%20Products&cq_term=PRODUCT_GROUP&cq_net=u&cq_plt=gp&cq_med=71700000044911970&cq_gclid=CjwKCAjwjdOIBhA_EiwAHz8xm1XiqXV6aooQoQ8sygbFMPD14qsC4CrcXHlDBi3bjWV8TXB0YZMnThoCTa0QAvD_BwE&cmpid=smsm:ds:GOOGLE:Woolies_8458_BAU_Shopping_Smart_Others_WW-0001:PRODUCT_GROUP&gclid=CjwKCAjwjdOIBhA_EiwAHz8xm1XiqXV6aooQoQ8sygbFMPD14qsC4CrcXHlDBi3bjWV8TXB0YZMnThoCTa0QAvD_BwE&gclsrc=aw.dsThose Hema maps are quite large scale. 1:100,000 is pushing the limits of usefulness, 1:50,000 or 1:25,000 are better. Used to navigate by scaling off a map 800m from a windmill or some other infrastructure point like a fence post, then set the odometer on the vehicle to get to the location one was looking for. It is now everything on a tablet with a mapping program that allows you to capture areas, make notes, fill in forms that are saved electronically with all the spatial information. For example the guys that do our weed spraying are issued a tablet and record locations sprayed, chemicals used and species targeted etc... |
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Post by Joey on Aug 13, 2021 14:20:25 GMT 10
I was thinking of waterproof options rather than laminating or sleeves so they can be easily folded up.
I saw some youtube vids on it and you can get a protectant paint for maps that allows you to still fold them up, but a quick look on fleabay that stuff is ex USA
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spatial
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Post by spatial on Aug 13, 2021 15:13:12 GMT 10
I was thinking of waterproof options rather than laminating or sleeves so they can be easily folded up. I saw some youtube vids on it and you can get a protectant paint for maps that allows you to still fold them up, but a quick look on fleabay that stuff is ex USA I am sure putting a cheap plastic laminate on will give water proofing. For <$30 a map you can purchase them with waterproof paper.... These are the 1:25.000 maps that I use. www.mont.com.au/products/nsw-topographic-map-waterproof-1-25-000 |
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bushdoc2
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Post by bushdoc2 on Aug 14, 2021 6:51:48 GMT 10
Where or how do you waterproof the maps? I keep Hema maps in vacsealed bags in my car for all of Central and Northern Qld in my small car survival type kit (which is just signal, maps, compass, fire starting and a good old Hootchie) Used on maps without probs, but not truly tested out in wet weather. For $11 a can, not too bad, anyway.
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Post by milspec on Aug 15, 2021 9:35:28 GMT 10
The qld .gov website lets you create a pdf map at scales of 1: 10k 25k 100k centered on a point of your choosing. Might see if I can put the pdf on a key and ask a print shop to print it on that waterproof/tear proof paper that our flying checklist used to be printed on. edit ... figured someone would ask for the link so here it is qtopo maps / custom |
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Post by Joey on Aug 15, 2021 13:02:24 GMT 10
Thanks, MS, I found that the other day and printed off a 50000 map of my town to teach the young fella some basic mapping principles and the difference between 4, 6 and 8 figure grid references.
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Post by spinifex on Aug 16, 2021 7:57:36 GMT 10
Where or how do you waterproof the maps? I keep Hema maps in vacsealed bags in my car for all of Central and Northern Qld in my small car survival type kit (which is just signal, maps, compass, fire starting and a good old Hootchie) Take them top a place like this: www.cartodraft.com.au/map_laminating_service_sydney.shtmlI had my topo maps done with a very thin plastic film. I keep them rolled. They can be folded for use in the field; but I would avoid storing them like that as the folds are where damage to the coating will occur. I've always wondered if spraying paper with a few coats of scotch guard would make it water resistant? And I mean resistant and not 'proof'. There are printable plastic films these days so if one had a USB full of high-res maps ... a print company could put them on pure plastic film. Or one might lazer print their own on A3 sized sheets and spiral bind them into a booklet. If I were starting out again ... that's what I'd look into. And ... a great easy option is to use CFS/CFA etc map books. I assume they are water resistant?? Being as how they're used in proximity to water?? |
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norseman
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Post by norseman on Aug 16, 2021 8:18:52 GMT 10
Rolled commercially laminated maps are good for use in vehicles or on vessels etc but not practical for field use if you are on foot. I cut my maps down to A4 size, write in the Eastings / Northings etc, laminate them with a cheap thirty buck laminator. You can slide the maps into the hydration sleeve on your pack or the pocket in a chest rig or plate carrier while you use the active map section in a map case or in the hand.
Should also mention don't be tempted to fold laminated maps as they will start leaking at the folds in very short order!
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Tim Horton
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Post by Tim Horton on Aug 30, 2021 13:57:30 GMT 10
I have wondered a time or 2 how magnetic declination worked there as apposed to this part of the far north west North America... We are a bit over 17* EAST....
I know OZ is big enough there are likely several different values depending where you are at..
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Post by Joey on Aug 30, 2021 19:00:56 GMT 10
The East coast of Aust is currently 13deg variation, but depending on the age of the maps it'll have variations of this printed on the scale legend.
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Tim Horton
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Post by Tim Horton on Sept 1, 2021 1:16:20 GMT 10
The East coast of Aust is currently 13deg variation, but depending on the age of the maps it'll have variations of this printed on the scale legend. East or west ?? ?? Another thought.... Is the south magnetic pole as far off from true south as in the north ?? ?? Interesting stuff to me, at least.... |
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