sat navigation on low speeds
Discussion
I just installed my sat nav (Becker traffic pro) in my car. It works absolutely perfect besides if I'm travelling on very low speeds (town traffic etc.) then the system seems to ignore all impulse . Is there a cure for that? If so where can I get it and is it hard to install? Questions over questions. 
I just installed my sat nav (Becker traffic pro) in my car. It works absolutely perfect besides if I'm travelling on very low speeds (town traffic etc.) then the system seems to ignore all impulse . Is there a cure for that? If so where can I get it and is it hard to install? Questions over questions.
The only real cure is to fit a second speed sensor. At slow speeds the TVR sensor either doesn't generate a sufficient big pulse to be recongnised or the electronics that sits between it and the speedo doesn't start working either. End result is no pulse for the sat nav. There are speed sensor types (Race logic sell them) that will work at any speed. Cost about £100.
I had the same problem, fitted a sensor on the driveshaft.A company called sailes marketing do a kit for £50, you will have to ask for it as they would normally supply an amplifier for the original system, but unfortunatley these amps do not work below approx 3mph. If you want details i can look back.
>> Edited by david beer on Thursday 29th May 12:53
>> Edited by david beer on Thursday 29th May 12:53
I am curious why it needs a speed sensor? After all, it knows how fast you are going, and in what direction. Is it just used in case it loses signal momentarily, due to high buildings for example?
The reason I ask is that I use a Garmin GPS V which most likely uses the same street level mapping (NavTech) as all the fixed units, but it can easily be moved between cars, or can even be hand-held when walking in a city. It is self contained, and therefore doesn't have a speed sensor. I've used it in several European countries in hire cars, as well as all over the south of the UK, and it is very handy to be able to drive straight to your hotel in the middle of Palermo for example, without ever having been there before. So far, I have never had a problem with loss of signal in any cities, only tunnels. So I'm curious what the speed sensor does for you.
The reason I ask is that I use a Garmin GPS V which most likely uses the same street level mapping (NavTech) as all the fixed units, but it can easily be moved between cars, or can even be hand-held when walking in a city. It is self contained, and therefore doesn't have a speed sensor. I've used it in several European countries in hire cars, as well as all over the south of the UK, and it is very handy to be able to drive straight to your hotel in the middle of Palermo for example, without ever having been there before. So far, I have never had a problem with loss of signal in any cities, only tunnels. So I'm curious what the speed sensor does for you.
My navi system only gets updated by sats every 30-40 seconds so in between it uses the gyro,speed sensor,compass to work out where it is.At a crawl in "town" it is possible to move quite a distance before the update. I think sat nav systems have much more info going on than the portable ones?
david beer said: My navi system only gets updated by sats every 30-40 seconds so in between it uses the gyro,speed sensor,compass to work out where it is.At a crawl in "town" it is possible to move quite a distance before the update. I think sat nav systems have much more info going on than the portable ones?
Some portables may be quite basic, but this one does point to point routing from any address to any other address, same as any fixed system. It doesn't have a CD drive or anything for maps, it comes with several mapping CDs covering the whole of Western Europe, and you have to upload chunks of map data from a PC into its memory in advance. However, in practice it can hold large areas of a country, and the map data for these sat nav systems all comes from the same source. Coverage of streets and even house numbers and postcodes is the same as any fixed system, and it shows all the same petrol stations, restaurants, hotels, garages, stations, and so on. It's accurate to within about 10 feet or so using the built in antenna, in other words it knows if you have only moved a car length, and it even knows whereabouts you are on a roundabout or complex junction at all times. It updates its position once per second, continuously. I can see that having the extra gubbins in a fixed unit could save the 30 seconds of time that the portable takes to establish its position when you switch it on. But I'm surprised to hear that fixed systems don't update every second using GPS, as it seems like a sensible thing to do when the technology is already there.
I use a Pocket PC with a Navman gps widget in flash slot, and tom tom navigator software. I have all maps of europe available which I load on demand, and it is pretty good. It satisfies my need for a navigation system on the odd occasions I need it.
It gives voice guidance, 3d view and down to street number directions. Not bad.
I hanker after a full blown system, but can't face the cost or hassle of installing one.
It gives voice guidance, 3d view and down to street number directions. Not bad.
I hanker after a full blown system, but can't face the cost or hassle of installing one.
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