Switched Power capacity

[Sgt.Cupid]

Need some advice on a bit of electrickery I want to do.
Firstly am I right in thinking there are only 2 switched 12v 5amp supplys on my 2005 GS? The hella one under the seat and the one on the left on the head stock.
I have 2 x 12v cig lighter sockets up front (one for heated vest the other has a 2 port 5v USB adapter in it ) and 5v 2amp phone charger mount connected to the hella socket.
My Zumo 660 is connected to the head stock supply.
What I now want to do is connect a 5v front and rear C6 dash cam set up with a loop recording and GPS function.
It's easier for me to tap into the hella socket supply but would that overload it? Or should I do the more difficult thing and splice into the Sat Nav feed?

TIA.

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[Bendy toy]

Get a busbar fuse box and supply it direct from the battery with a relay. Switch the relay from a convenient ignition switched live. The front CanBus switched satnav connector is ideal.

 

[bisbee]

Hella socket gives 5 amps appx iirc so a heated jacket pretty much takes all of that I'd be inclined to power that from the battery with it's own fuse I had a cigar lighter socket mounted on the frame for that purpose.

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[Sgt.Cupid]

Decided to splice into sat nav feed. And I've been educated with regards to Ohms law so 5amps at 12v give 60watts and I'm well below that.
Gonna get a dedicated 12v socket fused off the battery for the heated vest later in the year though.

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[Bendy toy]

Power = Volts x amps

Mr Ohm sad I = V / R Just saying