Bungonia Caves grid references and GPS / Google Earth locations

[Ben Low]

Attached is a list of grid references for many/all of the Bungonia Caves documented in the book 'Under Bungonia', and matching Google Earth file. The references provided in the book are only useful with the book's surface map, which is drawn rather unconventionally (aligned to Magnetic rather than Grid North, and also with an odd scale).

Here's a 'preview'  of named caves on a google map (max 100 marks):

https://mapsengine.google.com/map/edit?mid=z18pxnTUBFeo.kFw8W179g_ck

And if you missed it earlier, here's the surface map overlay for Google Earth: https://www.dropbox.com/sh/hq4gf4o9t46jje4/AACyRAkHl3dFmjumz_WXhWiBa/Google%20Earth%20Overlays

Aside: to correct from the Under Bungonia (UB) surface map references to UTM/GR, the following transformations were done to each point:

- split the 8 digit UB out to the easting x 1 and northing x 10 (in metres)

- apply a rotation of 11° around the centre of the map (remember your basic trigonometry? :-)

- shift by approx. 85m East, 95m North (dunno why this is only ~half the expected AGD-GDA distance); matched up the map overlay with aerial imagery by eye

Yours in Scouting,

Ben Low

Venturer Leader
1st Balgownie Scout Group
0407 17 25 21
ben...@balgowniescouts.org.au