Best scouting tool hands down, your feet and eyes. With my smart ass comment out of the way.
Recommend
1. GPS
2. Google Earth or just Google Maps (either pre-search areas on home pc or use cell but reception may not be reliable in all areas thats why pre checking before going out is a good idea)
3. Compass
4. Binos
5. Water/ Snack
Thats it for me. Just get out their and look for sign. Look for old rub lines and currently used trails. Look for food sources, the preferred ones, nearly everything is food out their but they have preferences on first choice.
Things you can take but are not essential. But might come in handy.
1. trail cam
2. Machete and hand saw. Some times it is good to have on you if you find a really good spot you can clear paths while out then just trim up before season vs doing all the work when its hot.
3. Reflector Tacks, If you dont have a GPS or good signal sometimes good to be able to mark your trail.