Precise to three millimeters. This tracking device was originally designed for sports. Can be connected to vertically any smart phone with a Bluetooth range of upto 100 feet. It also has a substantial on oard memory I case it travels out of range.
Ran out of media because hewasso popular with this product.
They use it in watter as it is fully water proof.
Mount to a docking station for charging and data transfer urgently available for about $200 per unit.