This is a Wherigo cache and if you haven't already got one you will need to install a free Wherigo player onto your smart phone or other device in order to play it, once you have installed the player you will then need to download and install the cartridge from the below link.....It sounds complicated, but seriously it isn't! Wherigo's are GPS location aware interactive Games/tours that can be played on GPSR, smartphones, PDA's, Ipads etc etc.
Free Wherigo Players - search download store for: OpenWIG (JAVA) , WhereYouGo (Android) , Wherigo (iPhone)
Once you have installed your player, Here is a useful Wherigo Player tutorial that will help you understand further Tutorial Cartridge
Download Wakerley Wherigo Cartridge (visit link)
This Wherigo takes you on an informative short walk around Wakerley Great Wood, you can take as long as you want or be round in less than 30 minutes its entirely up to you.