On Friday, October 30, 2015 at 5:47:15 PM UTC-7, Jonathan St. Cloud wrote:
Please correct me if I am wrong, but doesn't the Butterfly S and the LX90XX with compass option both have fluxgate compass? One would think with these instruments we would not have to have a whiskey compass, that just takes panel/glare-shield space.


On Friday, October 30, 2015 at 5:24:17 PM UTC-7, Martin Gregorie wrote:

You could get a reliable heading with a fluxgate (solid state) compass
but not, as you say, with a single GPS receiver.


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martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

The Butterfly S doesn't have a compass option, it has the compass as a standard feature. The issue might be whether regulations require a TSO'd compass.