I have a Garmin GLO2 Bluetooth GPS that could be attached to a UAV then the gps co-ords are available for any mapping application. I use OSMand+ for mapping on a 10in tablet. The Garmin GLO2 weighs about 60gm so that may be too much for your...
I had my local canvas worker make four with eyelets in each corner to peg them down. Had them numbered 1-4 . Cost about $180 Aust and that's about the same Canadian.
Neville
Queensland