The upper Dourbie river

Hiking distance : 16.5 km ; Hiking time : 05:00
Tayrac

The Dourbie river starts on the Lingas, a mountain region just south of Mount Aigoual and flows generally east to join the Tarn in the town of Millau. Along the varied river course, the Dourbie flows through green mountain valleys and deep limestone canyons. This hike sticks to the mountain valley and starts in St-Jean-du-Bruel, runs up the right bank of the Dourbie, crossing near Tayrac and returning to St-Jean on the left bank. In the springtime, this is a very picturesque circuit in an even more picturesque region. This time we don’t visit the canyons which are further downstream. Continue reading “The upper Dourbie river”

The tower of Brison

Hiking distance : 17.7 km ; Hiking time : 05:30
the tower of Brison

In september of 2016, our club hike took us to the upper Beaume river valley and the mountain village of Laboule. We stayed in the area 2 days to hike a couple circuits on the Tanargue. The Tanargue is both a peak and a ridge-line oriented roughly west to east in the southern Ardèche – about 2 hours from the croix-de-Gattigues. The average altitude of this ridge-line is around 1200 m, but one section, called the Cham de Cros reaches an altitude of around 1400 m. This “Cham” (cham is an old french word usually used to name a small plateau surrounded by deep ravines) is visible from a long way off. From a variety of lookouts near the croix-de-Gattigues the distinctive skyline of this plateau is easy to identify. When we reached the top of the Cham, we could see, to the south, a prominent but lower peak with a tower and a beacon. No one could identify the site that day. So we had to find out. Continue reading “The tower of Brison”

Les Fumades

Hiking distance : 10.9 km ; Hiking time : 03:30
feeder
livestock feeder

This hike loops around several hamlets in the municipality of Allègre-les-Fumades. Les Fumades was a popular spa in the 19th century, drawing visitors from as far away as the UK and Germany due to the reputation of it’s mineral waters. Wartime (especially the 1914-1918 world war) and economic changes have taken their toll and, although still a spa, the town is not as popular as it once was. Apart from the spa, the town retains several points of historical and photographical interest. Continue reading “Les Fumades”

Altitude measurements

I used a Garmin GPS 64 to record altitudes during a recent hike along the the Vidourle river-mill circuit and compared the recordings to the theoretical altitudes obtained by generating the GPX with an online tool using the IGN basemaps. Here below is a comparison chart.

altitude comparisons
altitude comparisons

First, notice there is a growing lag between the peaks on the theoretical profile (green line) and the recording (red line) with the peaks on the recording occuring later then the peaks on the theoretical profile. This is normal, because we did not stick exactly to the theoretical track. At Montredon, we wandered around the site which added some distance to the recording that does not appear in the theoretical profile. (Note: We also climbed a bit higher than planned.)

However, there is still something strange going on. The recorded Garmin altitude, starting from around 3 km in, starts tracking progressively lower than the theoretical altitude. The Garmin data stabilises between 10 and 20 m altitude while in reality, no point on this circuit is below 20-25 m so the Garmin data is incorrect. Is this because the differences are within a margin of error for altitude measurements with a handheld device ? Maybe but if so, why is the tracking much closer for the first 3 km ?

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