The common feature of Beidou Haichao and satellite phones is that they are communication tools in the signal dead zone; The differences are as follows: 1. The main communication functions of satellite phones are contacted by telephone. Although convenient, the price and convenience of satellite phones are relatively high; Although Beidou Haichao is connected through text, it can send information free of charge, and its one-click help and location information are very convenient. 2. New features: Hailiao group sending assistant and track tracking; group sending information and automatic report track storage in cloud disk These functions are not available in satellite phones.