GS165 and eS98 network

[Firewood]

This winter will spent updating my old 2006 electronics package. Currently
I'm using Classic e120, Smart pilot autopilot, Dsm300 sonar with a P66 transducer and Raydome Radar.

I just ordered the Gs165 and was thinking about mounting a eS98 next to it.
The GS165 needs an external gps antenna and the optional remote key pad.
My plan is to have the eS98 provide the gs165 with the gps info from its built in antenna and also control both displays using the eS98 key pad.
Right? Will the gps work that way? will it be as accurate as the external 130 antenna?

I will also be adding an Evolution Autopilot to my type 1 pump for my Verados.
A CP470 with High/Low transducers. The E98 is down vision capable and I will utilize that for my inshore fishing.
Also I'm on the fence for the new radar. Quantum Chirp or Digital HD dome.
The Digital HD unit has a bird setting, but I would think the Quantam Chirp would also be very good at picking up birds? any thoughts?