This is free.
Not 'great' but free. As Broch is going to suggest you really want a decent book on the subject matter to take out with you.
Becoming an expert tracker takes years of practice. To get you started, today we offer a primer on the basics of identifying the footprints of common animals.
www.artofmanliness.com
Thinking about where you are, your camp , its location etc you want to set up a couple of 'Track Traps' - tend to be located at natural narrowing choke points ( Gateways , breaks in hedges ) and the smooth/rake the soil to a fine level quality to pick up any wee beasties traversing through.
Then again - you're in Ireland so that would probably be washed away...