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* SPOT offers a light weight emergency beacon that when pushing an emergency button submits a distress signal via satellite with your GPS position to a rescue centre. This devise can also be set up to regularly send the GPS position in 10 minutes intervals and to display the hiked track on a map in the internet. We carried such a personal satellite tracker and our families and friends stayed much more relaxed because they could see us move day by day through the mountains. Unfortunately this devise is not particular reliable and only 5% to 20% of the position signals are submitted successfully when hiking in this area. Therefore if you wish to keep your family and friends updated you need to purchase and activate the tracking option while hiking. This ensures that at least some positions are submitted successfully every day. In theory you can manually submit an "OK" message without purchasing the tracking option but this may result in rather long "black-out" periods since many signals don't get submitted successful and the devise itself does not provide any feedback if the signal was transmitted correctly or not. The other limitation of this devise is, that is cannot receive any messages or send messages written on the trail. You find further information to this devise on the [http://international.findmespot.com/ SPOT manufacturers homepage.]  * InReach from Delorme offers a similar devise with all but without the above capabilitiesmentioned limitations. But The inReach uses the more reliable Iridium satellite network and always provides a feedback if the position signal or message was send successful or not. This devise can send position signal in regular intervals for display on top of itan online map, it can the inReach is able to send and receive 160-character SMS text messages with the GPS coordinates to mobile phones or email addresses worldwide and it can post updates to social media. See the [http://www.inreachdelorme.com/ InReach inReach manufacturers homepage] for more information. The devise is more expensive than a SPOT and it drains the batteries faster but is the more reliable option.