4 led indicators, 1 power led, 2 satellite status led – Leica Geosystems GPS System 500 - Technical Reference Manual User Manual
Page 72: 1 power led 3.4.2 satellite status led

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3. Using System 500 without a Terminal
Technical Reference Manual-4.0.0en
3.4 LED Indicators
Every System 500 Receiver has three
LED indicators that inform the opera-
tor of basic Receiver status. The LED
indicators are located at the top of the
Receiver and are only visible when
the TR500 Terminal is not attached.
The top LED gives power information,
the middle gives satellite tracking
information and the lower gives
memory status.
Power
Satellite Tracking
Memory Status
3.4.1 Power LED
3.4.2 Satellite Status LED
Power LED off -
No Power
Power LED
green - Power
OK
Power LED
Flashing Green -
Power Low
Satellite Status
LED off - No
Satellites tracked
Satellite Status
LED flashing
green - first
satellite tracked,
position not yet
available
Satellite Status
LED Green -
Enough satellites
tracked to com-
pute position