See my embedded advice... which may beg more questions I'm sure. Sometime this basic stuff is better covered on the phone, PM me if needed.@HighTechPauper
vin - camera signal OUT
vout - vtx signal in - Check to see what the vTX can handle, many will take VBat directly from the ESC board where the pigtail attaches and can provide a very clean 5v/Ground for the cam. This can go a long way to you having clean video
(5v and ground to any 5v and ground for both).
Radio: Technically correct but we call them Receivers, the "Radio" or "Transmitter" or "Controller" is the thing you hold in your hands.
sbus from radio - RX6(S) (5v & gnd to 5v and gnd) RX6(S) - This is an instance where a UART is broken out for use inverted for SBus protocol
a spare pin from radio - rssi (for telemetry) ???? This depends a lot on what RX (Receiver) you have, R-XSR, XM, XM+, you said SBus so I assume you have a Taranis or Xlite? And if so what exact model
GPS: This should all be ok, but you won't know if there is am issue until it is all together and working, but I don't use GPS so I don't know if there are any caveats with this board or iNav/BF functionality you hope to achieve. If you are planning long range I can't advise, I am not sending my stuff more than 1/4 mile
GPS tx and rx - TX3 and RX3
5v and gnd - 5v and gnd
Only thing Im confused about (assuming the above is correct lol):
a. what is RX1(D) for Some protocols are inverted and some are un-inverted, because the F4 processor is not set up to do both like F3 and F7 boards the manufacturers have made some pins available for popular control protocols. That is why you have RX1(D) for DSMX Spektrum protocol, an Un-inverted UART port broken out for the user
b. what are TX1 and TX6 for (do the go to the radio?) No, they may not go anywhere, and heres why. There are rules that cannot be broken here, a port can only be used for one thing, even if only the TX or RX pad is in use, the other mate to it cannot be used for anything. For instance, you can't put SBus on RX6(S) and use TX6 for anything like Smart Audio or Smart Port from the Receiver if you had for example an R-XSR.
c.where is vbat going? Is that the full battery voltage? Do I have to connect it? VBat may not go anywhere, it depends. Yes, once the FC is jumper-ed to VBat on the ESC, then this pad will have VBat on it. Sometimes it is used to feed VBat the the vTX instead of taking the vTX right to the battery pigtail connection (When the vTX is rated for VBat, you simply MUST know what the input voltage range is for various pieces to hook things up optimally).