I have not played with the G-sensor in regard to parking guard, but at least on my Lukas where i played with such things it did appear like you was able to set sensetivety so high a sneeze would set it off.
One thing is for sure if i was ever to use parking guard in any dashcam i would rely on G-sensor too, motion detect just dont do it for me ( but it worked allright on my old LUkas LK7500, even in pretty dark conditions )
1. I would go with just G-sensor, motion detect will start on just about anything passing by in front of your car, from a starling to that huge SUV passing by, so expect many recordings to be made of irellevant events.
2. I think all 3 cameras you have narrowed down have prebuffered event recording.
3. Daytime no problem, night time can be a problem, there got to be some light for any camera to do its thing, and i am not sure a porch light will cut it.
But at home in the driveway if you have a good light triggered by a PIR sensor, then the camera in the car should do allright.
Or if you park under a streetlight.
4. All cameras have audio, but some are better than other, the SGZC you picked have the microfone in the headunit, so if you hide that really good you are allso hiding the microfone.
A DIY remote microfone mod is easy to do if you know your way around a soldering iron and a drill.
6. Live feed will be a problem, the cameras that do have wifi often have a lag on the signal, but a fjew seconds is not so bad.
BUT ! the transmitters allso seem to be pretty weak ones, and your camera is sitting inside a "metal cage" so that will put a damper on the signal too.
I guess if you have plenty of DIY skills at hand you could take a dashcam apart, and remove the build in antenna and then put a socket in so you can use a external antenna instead.
This will offcourse viod any warrenty.
If you really want this and some range you can tap into the AV out that most cameras have, and then put that signal into a transmitter like used for FPV on radiocontrolled things.
This will allso mean you can use a external antenna on the car, and you can get mighty strong transmitters on the legal 2.5 and 5.8 GHZ bands ( and whatever other bands you Americans have open )
Now this still dont mean you will have coverage from the car in the lot and all the way back in the mall your are in.
Allso since this is transmitting a signal you will allso need a reciver for that signal and a screen to see it on, and to my knowlege there is no of the transmitters for FPV stuff that can be recived on a regular smart phone as it is on its own.
But for the driveway at home it would work good, and you can get to see the signal with a pres of the button on your TV remove ( just connect reciver to a unused analog input on TV )
But at home i still recomend a good CCTV system for more than the cars in the driveway.
7. 360 coverage will demand 4 cameras in the car, and then we are at a place where you are putting a serious drain on your car battery.
For this to work you will need a good sized battery, and you will have to drive a lot every day to recharge the cameras after the nights drain, and if you then allso use the system the 7-8 houres you are working then you will be at or damm near a place where you will need extra batteries out in your car.
There are a fjew 360 cameras out allready, but they are all of the action style, so they dont have dashcam functionalety.
ATM there is no good 4 channel dashcam systems out there, there are some that look good, but then reading the small print it get hard for a dashcam expert to recomend such a system.
So as things are at the moment us addicts with many cameras in our cars rely on single cameras, and then a handfull of them.
That work fine for every day driving, for parking guard i dont know i have never used it just played a little with it way back when i had the Lukas dashcam.
The major minus with 4 single cameras is you have to go to each of then to retrive the SD card if you eant to get footage of it.
Good dual systems are allmost here with current gen, the comming generation should make sure they will now be good and really worthwhile systems.
And at least Street Guardian will be making a system with 2 small cameras on wires, and a headunit you can hide ( or not ) in your car.
BUT ! all that good stuff is somthing i expect we wont see before the tail end of this year, will be intersting to see what they come up with in the dashcam labs around the world.
There is some guy in here working in a roof mounted 360 camera, but many of us in here have a hard time with that for a host of reasons, never the less i am eager to see what he end up with.
