tracker 20 on Fjalls is still moving progressively in a straight line. It has risen in altitude too. Recent cold weather has stopped solar charging but it is still sending good data. I have deleted fix outliers as it moves less than 5cm but sometimes gets a 1m error.

the tracker had a “glitch” in january – perhaps tilting for a short period or some GPS-related issue – hence the “step” seen in the plots in January.

Looking at tracker 20 on Fjalls we can see it settling into winter – running on battery:

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?

however the Fjalls base stays quite warm (especially in the sun!) so is solar charging OK.

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.

Its altitude jumped upwards in mid december! we can also see the drop due to melting before september and the gradual rise during autumn.

Tracker22 has now moved 18m from its original position! – you can see a few outlier spikes due to inprecise GPS fixes but generally the data taken every 3hrs is superb!

Its temperature (not very accurate when it is sunny) has started to dip below zero.

We made a quick video clip of our tracker being flown out to Fjalls and a view of it once deployed:

Actually these were installed in 2012 – I just found some more photos showing out first gps ice tracker attempt. All post-processed afterwards (if data recorded!)

we painted the tripod red in the hope of finding it – we had to dig it out of the snow one day and it did help.. You can see the tripod bent in the snow..