Looking at tracker 20 on Fjalls we can see it settling into winter – running on battery:
![](https://glacsweb.org/wp-content/uploads/2024/01/tracker20-batV-1024x669.png)
now that average temperatures are below zero the solar charging of the battery is very rare (to save the battery from charging when too cold). It also skipped a few readings in january – which is unusual behaviour – possibly due to its base station misbehaving?
![](https://glacsweb.org/wp-content/uploads/2024/01/fjalls-base-1024x669.png)
however the Fjalls base stays quite warm (especially in the sun!) so is solar charging OK.
![](https://glacsweb.org/wp-content/uploads/2024/01/tracker20-plot-jan24-1024x669.png)
we can see from plotting lat/long that it started to have more outlier readings recently (bottom right). There is usually a very consistent plot of points.
![](https://glacsweb.org/wp-content/uploads/2024/01/tracker20-alt-jan24-1024x669.png)
Its altitude jumped upwards in mid december! we can also see the drop due to melting before september and the gradual rise during autumn.