A simple Multi using some fancy phone technology (-- no ladders).
Your TOTT must include a Mobile with 'various readers' like QR and NFC - most recent Androids should be OK; Apple certainly need to be later than iPhone7, better after X? - 'old bangers' might disappoint. This is an excellent excuse to upgrade your old phone :-)
Common sense / things to think about :
1 - Please do not attempt to park on or cross Lady Game Drive! Far better to start near the Southern end of St Johns Avenue or Western end of Spencer Rd (or from MX I at GCABCBT)
2 - Dark clouds, Heavy canopy etc. may cause gps to be a few feet off.. When you're at GZ it's a better idea to look for the Feature :-)
3 - Snakes really love the warm morning Sun
4 - There may be a tiny creek crossing involved ; slippery when wet
5 - *Disclaimer* Presentation of 'reader' data may vary based on your phone's configuration and apps installed.
enjoy