Please consider optional OBD2 reader when present.
This will easily deliver actual speed inside a tunnel.

A company named Movea has a middleware solution that could provider you the solution to do that.

vote for

Dead Reckoning

it's on page 1 top ideas

does anybody read the suggestions????

Most platforms support

Simulated Location

Android refers to it as mock location.

Flagship devices have a panoply of sensors to employ. Low end handsets or devices ought not have expectations of flagship performance nor ought they receive pandering.

°° should also accept external sensors via USB or BlueTooth (Raspberry Pi, Arduino, and Shields, et al) .. Assume fixed mount

Most platforms support

Simulated Location

Android refers to it as mock location.

Flagship devices have a panoply of sensors to employ. Low end handsets or devices ought not have expectations of flagship performance nor ought they receive pandering.

°° should also accept external sensors via USB or BlueTooth (Raspberry Pi, Arduino, and Shields, et al) .. Assume fixed mount

The gpsritter comment is pure FUD (extrabogus)

> car directly

A secondary GPS source, another popular suggestion from OP
http://waze.uservoice.com/forums/59223-client-how-can-we-improve-waze-on-your-phone-/suggestions/2360364-both-external-gps-and-internal-gps

might be the better compliment to phone mounting.

The better the sensor compliment on the phone, and [obviously] the higher quality, the more likely it will be precise for more users.

Couldn't Waze, when it re-acquires GPS signal after loosing it (probably because of a tunnel), just decide of some average speed for the whole "blind" segment (I mean, each sub-segment, based on length).

This would effectively let Waze process congestion inside tunnels (no matter the kind of tricky road connections inside), and stop it from suggesting congested tunnels forever.

Of course this would only work if the exit point of the tunnel is the one on the initially planned route, but in practice this is the case, most of the time.

Hi all. To give you some background on DR. The difficulty lays still in the Algorithms to correctly read out the sensors and convert it into a correct GPS data stream. The only and best option is to connect it to the car directly, either to the sensors or to the CAN-Bus of the car (which is even more difficult as every car manufacturer has its own flavor of CAN-Bus). But that is not possible for 99,999 % of the Userbase. So waze's only option would be to clamp the car to the street it is driving on and predict the position with the latest speed. Don't know how easy it would be for Waze to integrate that. But generally a good idea.

10years ago my old gps TomTom already knew the solution... Please wake up. Radar caught me in a long tunnel because my position was stopped. So boring...

When You drive into a tunnel and your gps don't pick up, Waze must continue to indicate the way based on your speed and last position you took.

for two years under review? any solution???

New chips have built-in ability to use the accelerometer and gyroscope for positioning and navigation. See, for example https://developer.qualcomm.com/mobile-development/mobile-technologies/snapdragon-sdk-android/features/location

Related: https://waze.uservoice.com/forums/59223-client-how-can-we-improve-waze-on-your-phone-/suggestions/3773519-support-odb-bluetooth-dongles

Actually, GPS Motion X Drive does this quite well, with sufficient caching of map data to carry me through the back of beyond in western Montana.

The ability to continue "estimating" your progress when you travel through a tunnel or lose GPS due to heavy cloud cover or whatever is one of the very few ways that Waze is inferior to TomTom. The exact mechanics are much less important to me than that some attempt at estimating takes place.

While probably harder, maybe the camera (if it can see out the windshield), could help with this too. If it can find objects in its FOV and then track how they are moving in relation to the phone (also assuming the phone is not moving, e.g. in a car mount), then conceivably you could track position.

combine with that external GPS idea .. possibly exterior mounted

and definitely implement deadreckoning as a feature itself in lieu of gps-alternative location sources

That dead reckoning is appealing