Wrong GPS localisation

Former Member over 8 years ago

Hi, I'm trying to implement an app using the GPS. My goal is to calculate a distance using two coordinates.

I noticed that if the watch doesn't found the GPS, the coordinate given is in Taiwan.

So I would like to know if it's possible to know (in my app) if the GPS has been found correctly?

Thank you in advance for your answers.

Sébastien

jim_m_58 over 8 years ago

When you start up GPS in an app:

Position.enableLocationEvents(Position.LOCATION_CONTINUOUS, method(:onPosition));

In the callback (onPosition(info) here), you have info.accuracy and info.position.

You need to check accuracy for the quality of the GPS - it's a number between 0 and 4, and there are constants you can use to compare,
QUALITY_NOT_AVAILABLE through QUALITY_GOOD.

The API describes the meaning of each of the QUALITY_* values. I suspect you're getting QUALITY_LAST and going with that, while you need to wait for QUALITY_POOR or above. I wait for QUALITY_USABLE or greater before I allow recording to start in my apps.

Former Member over 8 years ago

Hi Jim,

Thank for your answer.

I will try this.

Sébastien

Former Member over 8 years ago

It's working, thanks !

jim_m_58 over 8 years ago

It's important to use the accuracy when using GPS data, as even during an activity, it can change (say you run through a tunnel)

Former Member over 8 years ago

Yes, that's true.