Me and my Friends started a kinda nomadic world so we travel a lot around but often we loose each other because one Person saw something cool or one Person walked wrong or because of lags or so on. Also we cant Always talk and so we are really slow with the Keep redirecting and writing. Are there any mods that allow you to travel together with some Kind of Vehicle or really anything else ? Just shouldnt make travel too easy.. Or Maybe a mod that Shows other Players really big and obvious so you cant loose track .
Well, you could use minimap mods like Journeymap. They have indicators on the map for mobs, players (and self), and in some cases for plants and dropped items. Many also employ a waypointing system that also has indicators on the map for them. This should help you all keep close together, but it won't prevent you from wandering too far away to no longer spot each other on the map.
For exploration purposes, there are vehicle mods but I don't recall if any that have group-capable vehicles have updated to modern versions. A mod called MCHeli added in helicopters and planes that a small group could ride in at the same time, but last I heard anything about that was in 1.7.10.