It used to be important to navigate and log with the same GPS signals because of Selective Availability (SA) and sequential or limited multi channel GPS receivers which may not have been correctly set up to handle sailplane dynamic motion. SA was turned off permanently in 2000 and GPS receivers now have many more channels than satellites you will see at any one time and IGC loggers are now specified so that you can't do dead reckoning if GPS tracking is lost for short periods. Nav GPS is usually set up the same way as you want to get accurate winds. ( AVier has an internal GPS which is set up for sailplanes unlike Oudie)
The better GPS modules can be set up to be optimised for the type of vehicle they will be in.
The upcoming uBlox LEA-7N module will use GPS, Glonass, Galileo and QZSS signals although GPS alone seems adequate as I haven't seen fewer than 10 sats and more likely 12 to 14 during some recent testing.
Mike
> > -----Original Message----- From: Matthew Scutter > Sent: Sunday, March 24, 2013 3:32 PM > To: Discussion of issues relating to Soaring in Australia. > Subject: Re: [Aus-soaring] Low cost avionics > > Top competition pilots tell me you should always navigate by an > instrument connected to your primary logger to make sure you actually > round the turn, which would rule out the big colour moving map > outside. > >
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