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Unreliable GPS status?

Two times now I've started ride with a green GPS status but no distance at all has been logged at the end of the ride. I haven't been paying attention to the screen in these miserable dark winter conditions so I haven't noticed it during the ride.

Both times I've started the device from standby status and waited until GPS bars are green and then started the activity. The other time I put the device into standby and started it indoors, yet the device claimed to have GPS lock.

FW latest, 9.73. In attached pic I started device indoors with definitely no GPS signal but still green status.

  • The device will briefly say GPS Ready when it has got GPS lock. Also the position marker on the map has a question mark on it when you don't have GPS lock.  That question mark disappears when you have GPS lock.

    I would use those to tell if you have GPS lock or not and not rely on signal status lines.