Feature: Working location out on tunnels

[rafacouto]

It is a little bit annoying when GPS location is lost in tunnels and the current position on map becomes freezed until to the end of the tunnel. For example, Osmand does not inform when there is a speed trap in the tunnel or at its end.

I propose an improvement consisting in to calculate the estimated location based on speed before entering in the tunnel as a constant and the seconds from the lost of GPS signal.

The current location can be calculated over the main line of the route in the tunnel and navigation will be usually more comfortable. User must be informed that he or she is under a tunnel and location is calculated virtually (voice notification and a label titled something like "Under tunnel: estimated position").

[jkufner]

Theoretically it should be possible to use accelerometers to determine current speed and then extrapolate current position from last known position, planned route and traveled distance (since speed and time is known). In addition, a compass can be used to check whether user is still heading in correct direction.

If data from sensors are good enough, short-term odometry-like navigation should be possible even without following the planned route. I believe this is very nice use-case for Kalman filter.

In all cases, the user must be informed that position is inaccurate extrapolation and last known position should be marked in map. And this feature should not be limited to navigation only.

[vshcherb]

It was implemented in nightly builds already

[Tchiller]

has this been distributed already? At least in not-navigating mode, it is not working in OA+ 2.1.1

[stephan75]

I can confirm that this feature is working for over one year now, even in the "Elbtunnel" in Hamburg, when in Navigation mode.

About the cruising mode: What is when a tunnel is forking under the earth ... where should Osmand know what direction you proceed?

So I fear: no artificial position when just in cruising mode.

[Tchiller]

Fair enough. Thank you for the update, Stephan.

[reibax-marcus]

@vshcherb , can you point out what commits resolve this problem? As of OsmAnd+ v4.2.5 the navigation halts at the entrance of tunnels and doesn't resume until gps signal comes back. This results in missed directions and warnings.

[vshcherb]

It was 2013, so I don't think it's relevant any more to comment here

[reibax-marcus]

We should either re-open this issue, or open a new one then. Which approach is better?

[vshcherb]

reopen is not possible for issues of previous release i.e. > than 1 year. Please open new one and add all details you have, is it reproducible with simulation, recorded screenshot or recorded track.