How to avoid losing someone while traveling?

In addition to the other answers, when I go with groups we always set a meeting point every time we go out to a new place. A landmark or an easy place to reach will be perfect meeting points. So if anyone is lost he/she directly will go there, the rest will go there as well in case some members are missing. For kids, always teach kids the name of the hotel, so if they got lost the police can deliver them there directly or at least contact the hotel.

Another tip is to each one carry a map and to know how to back to hotel. In case of visiting places crowded with big chances to get lost, is important to combine before a point to meet. If it doesn't works, don't despair, at night you can find each one in hotel.

I've found a walkie talkie to be a very useful addition when hiking. However: This might not be the ideal solution if you're in a place where reception might be weak. I also don't think that a strap/buckle is a good idea, especiall in large crowds. You're going to annoy other people when they're getting cought in your "setup" or you might even hurt yourself. Bad idea.

No matter what you choose for staying in contact, you always should have a backup meeting point. It's not that hard remembering "If we get separated, we'll meet at XYZ at 17:00".

As a side note: I prefer not to enforce the "let's stay together" rule. In a crowded area this simply puts you under a lot of stress. You constantly check whether your party is still with you and forget enjoying the experience of just "being there". Give yourself some slack and arrange something kike "We'll try staying together but if you wanna take a look at X or get stopped by Y then we'll meet again in two hours at Z". A lot more enjoyable.

Of course this doesn't work that well with small children :)

I disagree with the other uses in a meeting place or a map. Those are great ideas but eventually you're going to forget. You're traveling, you're always in new places, seeing new things. I would suggest getting a 1990's brick phone and traveling with that. They last like 140 hours of battery life so that's normally not an issue. They are cheap, SIM cards are relatively cheap for a small pre paid one. That way you can get in contact with each other regardless of where you got separated. As the other people suggested, you should know where you're staying but cell phones are the best safety device in the world in my opinion.

Even in the age of mobiles there is always the possibility you will lose each other. The country may not have many cells (third world), the connection can be bad (silent zones) or the country uses another band / is prohibitively expensive. So what we need is a simple rule:

• If someone get lost, wait a predetermined amount of time (I used 15 minutes) at the last position all people were together ! Both people do know then how long to wait and if there is a chance you will meet easily. But there is the possibility you cannot use the rule because you are traveling longer.

• After that it depends what were you planning. If both parties are independent (each has money, papers, but perhaps not the hotel keys), you will meet at the hotel in 3 hour intervals (12:00, 15:00, 18.00...).

• If a party is dependent on the other and the 15 minute time interval failed, both parties will march straight to the main railway station at the main entrance. If the location has no railway station (village), use the most conspicous object inside the village (which will be here in Europe mostly a church). At night time use the police station.

Although we had our share of disagreeing bystanders, we were quite happy with our buckles. When it comes to small children you should care less what bystanders.