Using Loran - NorthStar 957 Operator's Manual

Chapter 5 - Determining Your Position
DGPS message
TOO FEW CORRECTIONS
POOR BCN DOP
OLD CORRECTIONS
DGPS IN USE/OK
UNKNOWN

Using loran

Selecting and
displaying loran
Page 58
Table 4: DGPS status messages (continued)
Meaning
DGPS is off because not enough satellites with corrections are
available.
DGPS is off because the satellites with corrections have poor
geometry (DOPis an acronym for Dilution Of Precision).
DGPS is on, but the current corrections are older than the timeout
you've set in the receiver options (see "Choosing a DGPS correc-
tions time-out" starting on page 150).
DGPS is on and the corrections are current.
An unknown status code has been received from the GPS receiver.
This section explains how you can use the 957 to navigate
using displayed loran coordinates if the 957 is connected to an
loran receiver (such as the Northstar 800). If you don't plan to
use loran, you can skip this section.
To display loran time differences (TDs) from a connected loran
receiver:
1. Press the STAR key to display the OPTIONS/SERVICE
INFO screen.
2. Press the NAVIGATION OPTIONS menu key, then select
the NAVIGATION SOURCE field.
3. Press the EDIT menu key, then press the CURSOR PAD to
display EXTERNAL LRN as the position source.
4. Press the ENTER key, then press the RETURN menu key.
5. Press the CHART key to display the GPS POSITION screen.
6. Press the CHECK LORAN key to display the LORAN POSI-
TION screen.
957 Operator's Manual, Rev. B