You should be fine mounting a GPS unit on the dash and getting a signal. The further forward to the glass you push it the better. Acquiring connections with satellites can take a 'little' time depending on what you have.
GPS speed camera databases are almost spot-on with fixed camera sites, but obviously are limited in their use with regards to mobile camera locations.
I bought an Inforad from the woolies web site for 39.99 and have to say I have found it very effective. Unlike my TomTom it only warns of speed cams (gatso) not mobile or red light but it does beep until you are at the right speed. You can customise how it alerts you and turn off the beep if it annoys you. I have mounted it using the velcro pad supplied on top of the centre air vent and apart from the first time it acquires the sats within about 1-2 minutes maximum.
If you are going to use it with a TomTom or other device you will need to buy a multiple power point from Halfords which also makes the inforad easier to plug in as it has a USB lead for the power, a tight squeeze in the mini cig lighter socket!
For the price I would say it's unbeatable and could save 3 points and a fine, especially if you drive your MCS the way it wants you to.
I bought one from Woolworths for £39.99 too. Took 13 mins to get the satellites first time, other than that it does them straight away. It's no radar and laser detector, but it's definately worth £40. It does all different types of cameras, and it is directional. It's just like all other GPS speed camera detectors, except no flashy screen. You can even input possible mobile camera locations so it warns you there's a possible target, it logs info so you can check your driving stats and SOMEHOW, I don't know how it can be used as a GPS receiver to turn PDAs and Smartphones into satnav. It has to be plugged in all the time and has only has a single socket, powered USB.
A friend of mine has just bought the new wireless Road Angel for his BMW M3, he travels all over the country and he has said it is the best he has had, and he has tried quite a few.
If you don't mind spending little bit more he picked that Road Angel up from Halfords for £200 i am buying 1 on Saturday.
I have it for a couple of weeks and not impressed. Slow in tracking sats and keeps on loosing them, hence frequent bleeping. Therefore, I am not sure its accuracy. Mrs pulls it off when she drives ! Bulky and the connection cable is a USB pc cable.
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