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[aprssig] ATV integration idea

Wes Johnston, AI4PX wes at ai4px.com
Fri Feb 8 01:55:40 UTC 2008

There is a speed threshold you can set, and most people set it to
something low like 4 mph.  If below the threshold, the GPS will use
the compass, above it and it calculates a heading based on motion.
The trick here is to set that threshold speed so high that you can't
achieve it, and that forces the GPS to always use the compass.  In
this case, the threshold would be set faster than the vehicle i'm in,
and if the GPS is pointed to the side, it should read out the
direction the GPS is pointing not the direction I'm travelling.


On Feb 7, 2008 8:18 PM, Keith VE7GDH <ve7gdh at rac.ca> wrote:
> Wes AI4PX wrote...
> > The slick part would be to attach a GPS unit with compass to the top
> > of camera and set the switchover threshold of the calculated
> > heading/vs compass heading to a speed faster than plan to move.  That
> > way the heading indicated to aprs would be the direction the camera
> > was looking.... and clients like xastir and winaprs would show a barb
> > from the aircraft indicating the direction the camera is looking.  I
> > think the gps76cs and the rino130 will do this.
> Wouldn't the APRS speed and heading be the direction the GPS receiver
> was travelling? I'm thinking that e.g. the 76S flux gate compass on the
> LCD display would indicate the direction the GPS was pointing.
> > Please reply off sig..... (like anyone ever does! lol)
> If I did, no one would be able to pick holes in my comment!
> 73 es cul - Keith VE7GDH
> --
> "I may be lost, but I know exactly where I am!"
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