Traffic depiction on Plates

[smbohn]

Shot approaches yesterday and I noticed that the traffic location, when depicted on the approach plate, was incorrect. I had ForeFlight up with the same plate, so I was able to confirm my own ship location matched, however FF showed the traffic in front of me (which was correct, confirmed visually) and the Horizon showed the traffic behind me.

On sectionals and IFR Low traffic is shown correctly.

Is there a calibration process I should go through for the approach plates?

The Horizon is running V9.

[GRT_Jeff]

There's no calibration. The plates have latitude and longitude coordinates assigned by Seattle Avionics and the EFIS plots your coordinates and the traffic coordinates relative to those. The plates only have one set of coordinates for the main part of the plate, and some plates have different scaling in different areas (far away navaids and transition fixes), so it is possible for traffic to appear misplaced, but not if you are in the same area. If you are in the same area then the traffic has to appear correct relative to you. If your own plane appears correctly on the plate then the plate coordinates can't be bad. Give me the name of the plate and the area you were flying in and I'll try it with simulated data.

[smbohn]

Hi Jeff... the airport was I19 - Greene County and the approach was the RNAV RW 25. We were over TUNNU at the time.

[GRT_Jeff]

I didn't find a problem. My simulated plane and traffic appeared on the plate correctly. If you see this happen again and you record the data with the DEMO RECORD function I should be able to duplicate it by playing the data back and figure out what's happening.