http://www.ontla.on.ca/web/bills/bil...etail_the_bill
Link to the new legislation above
even if you don't know you are trespassing , you are deemed to be willfully assuming all risks under the occupiers liability act.
Just because there was no sign, doesn't mean you were not trespassing, only means that before you will be charged with trespassing, you would need to be informed verbally to leave, given written notice or signs clearly posted.
One of the best parts of the new law. If it wasn't in there most snowmobile trails in Ontario were going to lose access this fall.