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I am using an oldeer Ilec SB-8 STF vario system, am very happy with it 
		
	
		
		
		
		
		
	
		 
		
	
	
	and absolutely love the vario function (been an Ilec user for many years) but in my Tetra-15 I am finally using a STF system, and have a few questions. Since this unit does not use GPS info , when I am in a headwind or tailwind the P/S info is all the unit has available for speed info...............yesterday I was in an area of extended strong sink, along with a strong headwind............with no GS reference (per GPS), what kind of accuracy does the SB-8 STF info have? And what can I do to remedy this. Another issue on that flight was a battery that dropped below 10volts............the STF needle was behaving rather badly! Brad  | 
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