The Topcon Legacy E is developed around a full function Euro Card design, which allows use of GPS and/or GLONASS L1 and L1/L2. Units can be configured with various different serial ports.
Another unique advantage of the Legacy series is the software upgrade-ability, which allows the user to upgrade his receiver at basically any time, without having to send the unit back to the service shop. Just upload a new configuration file via the convenient PC CDU interface.
Also processing and various internal memory options can be easily upgraded later without having to return the unit to the supplier.