1. certain types of tuners are expensive. 2. connection with other equipment and facilities, some can only show coordinates. Some cannot be connected with another tool or a small computer (PC).
1. Receiver certain expensive 2. Connect with other devices, and ease some display only the geographical coordinates. Some machines can not connect to other tools or small computer (PC) has.
1. Receiver some kind of expensive.2. Connected with other devices and ease some show only geographic coordinates. Some machines can be connected to other tools or small computer (PC).