The start of the track is shown on Google here:
http://maps.google.com.au/maps?q=-41.789873,146.156702&num=1&t=p&sll=-25.335448,135.745076&sspn=38.161973,47.373047&ie=UTF8&ll=-41.789201,146.156745&spn=0.025214,0.038581&z=15Basically follow the signs much of the way to the Walls of Jerusalem, pass the Parangana Dam (first big one), you will run out of bitumen eventually after skirting the lakeside, not too long after that you will cross a small river (the one that you can see a weir on the right side of the road just upstream of the bridge), this is the Arm River. Just after this there is a major T intersection (almost Y actually), turn right there. (If you come to a short section of bitumen with a picnic shelter on the left side of the road you have gone too far, do a U turn and go back).
Follow that road for 15-16km or so (don't turn left up the hill at a minor Y junction) and keep your eyes peeled for the small wooden Arm River Track sign. At this sign turn right again and no sooner said than done you are at the car park, such as it is. Should be pretty straight forward, it's a fairly popular spot.
Watch out for wildlife and especially log trucks. Have fun!
P.S. Assuming you are coming on the Spirit, firstly follow the signs to Cradle Mountain and Sheffield until you reach Gowrie Park (big mural on right side of road). A couple of minutes after that you turn left towards Lorinna (onto the C138). A bit further on, well past the first bendy stuff, Stay on the C138 (Olivers Road), at this intersection
http://maps.google.com.au/maps?f=q&source=s_q&hl=en&geocode=&q=&sll=-41.541638,146.182194&sspn=0.025311,0.038581&ie=UTF8&ll=-41.541638,146.182194&spn=0.025311,0.038581&t=p&z=15it is quie easy to go straight ahead onto the C139 down to the Lemonthyme Powerstation and Lorinna. In case you are wondering, don't bother visiting Lorinna - it isn't worth it.
If you get on a gravel road before passing a big dam you are in the wrong place!
If you come to a second even bigger dam (on the gravel road) you have gone too far!
If you wind down a very steep hill to a significant bridge with a much much bigger dam upstream a bit, you have missed the turn off and are headed to Cradle mountain!
If you can't find any big dams I'll be damned!
