a TNC-connector for external UHF
antenna, only for models with UHF
radio
b Battery compartment with
microSD and SIM card slot
c Keyboard with LEDs, ON/OFF but-
ton and Function button
d Serial, USB and power port
e Antenna Reference Plane (ARP) is
where the instrument heights are
measured to
Zenith15/25 Pro
components
Instrument Components 10
en