garygid wrote:Has anybody tried "inserting" a "low-speed" pulse train, to make the car think that it is still moving, but slowly?
What speed is slow enough to activate the menus, maybe 1 or 2 mph?
At that "fake" speed, is the GPS positioning still active?
Am I missing something or is the entire purpose of the speed sensor with regards to GPS to provide additional information to increase the accuracy? Thus giving it inaccurate information is still a problem. So even if you faked it with a slow signal you are going to have the same problem only to a lesser degree. When I've driven around with the speed sensor turned off it'll stay still and then every once in a while jump closer to where I am. I assume it uses the speed sensor to fill in the gaps between these updates and augments with the compass and it knows which direction to move you.
Anyway, I do like the idea of a light so you can tell if you forgot to turn it off. The carkit harness exposes the wires for you and it also resets every time you turn the car off so that's a nice bonus if you do forget to turn the override off. Not sure what kind of circuit you'd need to add for a light though.
The speed sensor is really for dead reckoning and does help with the accuracy, but given improvements in the GPS technology and the fact the position is overlaid on a map the need for dead reckoning is less important these days (It is useful for things like going through tunnels etc). If you think about the portable devices like TomTom etc, they do not have the speed sensor and do a pretty good job without it.
The thing is at the moment the navigation system doesn't even bother to check the location via satellites if it doesn't think you are moving. If we could trick the system in to at least using the location from the satellite the hope would be that it would be a lot better than nothing.
The question is of course how important this all is, because if the only reason for enabling the bypass is to enter a location or use an otherwise disabled function then is the fact the location isn't updated for the few seconds an issue.
Regarding the light, I would be happy to add a light to the circuit if that is what people want (it will only add a few cents to the cost). The question of course is where to mount it and I would look for something that can be easily mounted. I know you already have a kit, so I will make sure whatever I come up with that I will find some way of easily retrofitting to your kit.