Were you speeding?
Was the limit 30?
Ok. Whichever is right then you were over 30.
What were you hoping to achieve?
I'm really sorry but I'm afraid that is not going to succeed.
The reality is that you can plead not guilty and fight it.
However, you will lose. They are not going to accept the findings of your company tracker over that of a home office approved reliable device and even if they do you were still speeding as the limit is 30.
The same offence is committed if you travel at 31 or 36.
On your second point, 10% and 3 is a complete myth. It arises from sites like Pepipoo where people talk nonsense and encourage other people to bring defences that see them hit with costs order.
Devices are generally set to 10% over the limit to ensure reliability especially at lower speeds but that doesn't mean they cannot prosecute anything under.
Not sure what you mean about the location? You don't seem to give me information upon it?
I'm happy to continue with this but please rate my answer.
If the location is wrong then you could arguably make a point arising from that.
It depends whether you are willing to risks costs.
The reality is that they will find this in the end and then you would have no option but to plead.
It depends whether the opportunity of escaping it worth it balanced against increased costs.
All the best.