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Collecting Almanacs
Collecting Almanacs
Each satellite broadcasts a message (almanac) which gives the
approximate orbit for itself and all other satellites. If the receiver has
an almanac, you can considerably reduce the time needed to search
for and lock on to satellite signals.
NOTICE
NOTICE
See also “Step 2: Activate OmniSTAR Service (Optional
Service)” on page 2-4 if using OmniSTAR service for
subscription details.
The receiver regularly updates the almanac and stores the most recent
almanac in its Non-Volatile Random Access Memory (NVRAM).
1. Set up the receiver and external antenna in a location with a clear
view of the sky.
2. Turn on the receiver.
3. Wait for about 15 minutes while the receiver collects almanac
data from the satellites.
NOTICE
NOTICE
If 15 minutes have passed and the receiver does not lock
on to satellites, you may need to clear the NVRAM. See
“Clearing the NVRAM” on page 3-32 for this procedure.
You will need to collect or update the almanac:
• If the receiver has been off for a long time.
• If the last known receiver position, stored in the NVRAM, is
different from the present position by several hundred kilometers.
• After loading a new OAF.
• After loading new firmware.
• After clearing the NVRAM.
• Before surveying.
P/N 7010-0727
3-19