I thought a Logic puzzle would be fun. You are looking for a nano magnetic cache. You will need a decoder to get the answer and the true coordinates. Be careful not to knock it into the grass (it is tiny! )
****Congratulations to eagle700 for FTF***
BULBS
There are three switches downstairs. Each corresponds to one of the three light bulbs in the attic. You can turn the switches on and off and leave them in any position.
How would you identify which switch corresponds to which light bulb, if you are only allowed one trip upstairs.
answer: Xrrc gur svefg ohyo fjvgpurq ba sbe n srj zvahgrf. Vg trgf jnez, evtug? Fb nyy lbh unir gb qb gura vf ... fjvgpu vg bss, fjvgpu nabgure bar ba, jnyx vagb gur ebbz jvgu ohyof, gbhpu gurz naq gryy juvpu bar jnf fjvgpurq ba nf gur svefg bar (gur jnez bar) naq gur bguref pna or rnfvyl vqragvsvrq. Pbbeqvangrf: A 87° 72.898' J 45° 1.417'