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I'm looking for a good (online) source of hiking maps for the Grenoble area in the Alps. I mean maps that allows you to plan a one- or mult-day trip/hike and that are sufficient during the trip itself.

If possible, they should be for free, and should show what special equipment might be needed on which ways.

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This question might fit better at The Great Outdoors. – gerrit Jun 14 '13 at 9:17
for Switzerland, try – Ben Crowell Jun 23 '13 at 23:00
up vote 5 down vote accepted

IGN produces several series of maps covering the whole of France. For hiking, I always use TOP 25 maps (1:25000 scale).

You can buy a map covering a part of the grid (Grenoble is 3335OT), have them print a specific area on demand (only slightly more expensive and convenient if you want an area that is in between two maps of the regular series) or peruse them for free online (the system had many problems at the beginning and it is still somewhat difficult to get around but it's all there). I don't know about using the site on the go or printing/downloading, I always get paper maps before serious hikes.

There are also two other options that I never used. TOP 100 are less detailed but I believe that they have more touristic information (trails, mountain huts, it's all there on the TOP 25 maps of course but it's so detailed that you sometimes need more effort to figure things out). TOP 75 maps are new and especially designed for hiking. Unlike the other two, they are not available for the whole country but there is one covering the two main mountain ranges around Grenoble. Obviously it's not online but other than that, it could be a good choice for your trip.

There are also apparently some mobile applications (more information in French here and here) allowing you to download these data and use them on a GPS/mobile device but I never tried any of them.

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In the end, a good trip was scheduled by the local organizing comittee of the meeting, so I didn't need to get any maps. Still, the answer is certainly helpful, so here the tick goes :) – yo' Jun 24 '13 at 11:28

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