The SHCC has posted four maps of Puslinch Tract (Twin Ponds). The first two maps are GPS based. The next two are detailed user generated maps from local trail users. One is from the Stars Orienteering Club:, while the other is from a mountain biker.
The last map is from 2007 and targeted at cyclist. However, there have been some minor changes since it's creation as a few new trails (mostly shortcuts) and a few new features (log piles) have been added by the local community.
To read the post and view the maps, click here.