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UPDATE 22.01.2019:
Well guys in the end I went for the Talkytoaster "Alps" series of maps which includes CH and the surrounding areas. https://shop.talkytoaster.me.uk/prod...alps-only-dem/
Loaded it on my phone, set it to high detail and it seems pretty damn good so I am looking forward to trying it out in the mountains soon. It cost around 18chf in total... vs the 300chf that Garmin are trying to charge for the Swiss Mobility Topo maps.
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I have been doing a lot of research on 3rd party maps and there are tons of options out there, but the problem is that not all of them have what I need. Which is ideally:
Full Europe map (but I can do CH only if needed) Detailed topography including contours and elevation Hiking/biking trails (as much as feasible)
Routable
Options I have found so far are:
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Opentopomap : http://garmin.opentopomap.org/
Seems to have a good level of detail and is routable, with optional contour layers, but only seems downloadable in smaller portions as separate maps, not as one larger Europe map. However, the "Alps" map may suffice for my purposes. I will try it tonight and see if I can give some feedback.
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Openstreetmap: https://www.openstreetmap.org/export...47.3473/8.5077
Pleasing and easy to read format with a decent level of detail but no contours or detailed topography information.
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Wanderreitkarte: https://wanderreitkarte.de/garmin_de.php
Decent level of detail (though lacking DSM shading) and easy to read, has hiking routes, but is not routable.
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Talkytoaster: https://talkytoaster.me.uk/
These maps are known for being very good and are pretty cheap, but all have to be purchased separately as countries which is not so ideal.
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So, any input from Garmin Fenix owners who use their watches for similar things and have some knowledge about and/or experience with this topic would be much apppreciated. Cheers.