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| Google Earth was very helpful to plan the trail from the river Polcura to the northern end of the Laguna de Las Lajas and over the ridge to the hydro power station El Toro. On the satellite images the "bad weather escape route" well visible. This gave use a save and easy exit from the wether exposed ridge while a snow storm closed in.
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| rowspan="3" | GPT04
| Pablo Azua Garcia
| Pablo Azua Garcia published on trekking.com a route from the "Piedra del Indio" to Trapa Trapa. This verbral description provided a useful hint to search this trail on the satellite images of Google Earth were most of the track can be seen quite well.
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| Google Earth| Most of this section was planned using Google Earth. The trails and minor roads are generally well visible on satellite images and the few not visible parts were easy to find when hiking this trail.|-style="vertical-align:top;"| Lonely Planet | The trekking guide book "Trekking in the Patagonian Andes" describes the trail around the volcano Antuco. The entire cicuit is incorporated into the GPT either a regular or optional route.|-style="vertical-align:top;"| rowspan="3" | GPT05
| Juan Francisco Bustos
| The Panoramio images of of Juan Francisco Bustos indicate a trail in the valley Cochico. This images together with bits and pieces of trails visible on satellite images in Google Earth helped us to find a good traverse from Trapa Trapa to Laguna del Barco.
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| Google Earth
| A good part of this section was planned using Google Earth. The trails and minor roads are partly visible on satellite images. The not visible parts were searched when hiking this trail.
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| rowspan="2" | GPT06
| rowspan="2" | GPT08
| Luis Toro
| The A [http://www.wikiloc.com/wikiloc/view.do?id=9113104 wikiloc track] published by Luis Toro shows a hiking and horse trail that avoids walking on the main road. This route is now incorporated as an hiking option and will probably alter the regular route once this track is confirmed by another hiker.
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| Google Earth
| rowspan="2" | GPT09
| Andes Mountain Expediciones
| The A [http://www.wikiloc.com/wikiloc/view.do?id=2281818 wikiloc track] published by Andes Mountain Expediciones shows the rather hidden trail via the Laguna Hualalafquén.
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| Google Earth