[TG] 3D Mapping

[Devocean]

Hi Guys,
Have a slight glitch and looking for some advice.. I have:
3 x Axiom 9, True Vision RV220 (p&s) & a B60 (20 offset)

I was running the internal antenna for GPS on the Master, however found drop outs .. possibly dash related metal.
So I installed a RS150 External Antenna…
When I enter 3D Scan, (using GPS Lock) it doesn’t map the ocean floor anymore, however it still does under “rolling”
Yet the GPS works fine for all other applications
Any way you could simulate this

Thankyou
Ian Hall