Page 60 957 Operator’s Manual, Rev. BChapter 5 - Determining Your Positionlongitude position fixes, the GRI must correctly match the GRIbeing used by your loran receiver.Viewing loranwarningsThree possible loran warning indicators obtained from anyNorthstar 800 series loran receiver are displayed to the right ofeach TD. (These indicators are available only from Northstar800 series lorans.)The L/L indicator to the left of a TD designates it as one of thetwo TDs that the loran receiver has chosen to use to calculatelatitude and longitude.The F/L indicator to the left of a TD indicates that it has beenforced to be used to calculate latitude and longitude.Returning to GPSnavigationTo return to using GPS signals for navigation, repeat the stepsshown for selecting loran in “Selecting and displaying loran”on page 58, but specify GPS instead of loran.Using Phantom LoranIf you have lists of fishing spots and other waypoints that yourecorded as loran time differences (TDs), the 957 canautomatically convert its GPS coordinates into TDs—in realtime, as you travel—letting you display your current position asTable 5: Northstar 800 loran warning indicatorsIndicator MeaningSNR Signal-to-Noise Ratio is low—use cautionBLNK Coast Guard is transmitting a blink signal, indicat-ing a probable transmitter problemCYC The receiver has detected a possible cycle slipLOCK The loran has locked onto the loran track point (thisisn’t a warning indicator, but an indication of normalperformance)
