G3X does not show plane on centerline

[PilotjohnS]

I have a G3X with external GPS antenna, G5 off on left side of panel and a GNX375 with external GPS antenna.
When I landed last night, the G3X synthetic vision showed me 25' left of centerline while I was taxi down runway's centerline.
Last week, did an ILS approach with VOR/ILS antenna in right wingtip and AP flew me down offset to the right (Was expecting it to be too the left of centerline since ant in right wingtip)

How do I calibrate G3X/GNX375 GPS to get me on centerline?

Could it be the WAAS was messed up?

 

[maus92]

Where did you install the externals antennas and did you configure the devices for the exact location of the antennas?

 

[PilotjohnS]

Where did you install the externals antennas and did you configure the devices for the exact location of the ntennas?

Well. Now i have configured antenba properly. It was set to have antenna 5 feet to the right

DUH.

So i think i fixed it.

Test flight showed all is well. as i said before, the plane flies better than the pilot.