Being tailgated (new driver)

[AncientWasp]

Recently passed and got a hatchback as that's all I need. I stick to the speed limit but I'm finding a lot of people don't (I'm told some people memorise where the speed cameras are?) But what I'm getting annoyed at is almost always having someone (men) in SUVs or vans driving about an inch away from me, seen a few shaking their head, throwing their hands up etc.
I let them overtake where possible, but obviously not always safe. Is this something I just have to put up with? Highly doubt they'd be doing it if I were male and in an SUV.

Indicated speed where available on a Sat nav is more accurate than a car speedo

Not necessarily no. Depends which sat nav you use and how your driving. The speedo is a constant and you should get used to how it works.

It depends.

For driving at relatively constant speed it probably will be.

But you have to remember the way it works is speed=distance/time and the calculation of that (and the rate of updates to the display) is quantized. So if you are braking/accelerating a lot during a calculation interval or over several intervals then it may well be less accurate than the readout of the speedometer.

It may also fail to pick up a change in position (say you go through an area of dense trees/poor satellite coverage/interference) over several seconds - my guess is in that case it would probably just keep the display speed value constant.

A speedometer is not legal unless it is within certain tolerances so most of them are designed/built with contingency in mind to meet those tolerances. I'm guessing satnav companies have no responsibility or provide a guarantee any degree of accuracy/tolerances on their devices so if you rely on them you take your chances.

If someone doesn't already know how a car speedo works then I suggest they shouldn't have a license.
And how erratic do you drive to throw GPS out on a sat nav?!
A speedometer calculates speed using wheel rotation and an assumed tire size. If your tires are worn down, inflated improperly, or you change to a different wheel size, the math gets altered, causing the speedometer to become even more inaccurate.
Purely from an accuracy thing, Sat nav is generally more accurate.
Edit......look it up.

I cannot wrap my head around things, and I’ve seen this in many other threads more so than this one, like “oh other drivers will be aiming for 32 in a 30 so your driving at 29 will be frustrating”… really?? I honestly think if being forced to drive 3mph slower than you’d like to causes you any emotion at all really, let alone frustration that causes you to drive dangerously eg tailgate, you really shouldn’t be on the road, and you should probably seek therapy for your lack of emotional control.

I didn’t say don’t be aware of it. I said stop worrying about it.