Tracking with Your Mobile Phone, No Need for an Extra Device
Using Tracking and Compass Feature on Google Maps
Waterproof Dog Tracking Collar for Hunting (with GPS) without the need for SIM cards.
It works with VHF frequency. Working distance is between 1-7 km depending on environmental conditions.
You can track from your phone with GPS without a SIM card. You can also use the compass tracking feature on the VHF band at the above-mentioned distances.
