Here are some Portable Device Companion Applications (iOS/Android)
1 - It would be interesting to see which other video games have or will have companion apps
2 - It also be interesting to hear what folks think of the existing companion apps
Tuaw Sony releases a PlanetSide 2 app for iOS by by Mike Schramm 15 APR 2013
Sony has released PlanetSide 2 Mobile Uplink (free, universal), an iOS app that connects with the popular online game PlanetSide 2. The MMO has you traipsing around another world, trying to claim facilities and land for one of three factions. Now, PlanetSide 2 Mobile Uplink will help you track those factions, your progress in the game and even lets you connect up with friends.
You can track your own online status, as well as your kills and all of the "cert points" you've earned (the game uses a certification system to unlock vehicles and weapons). And you can see a full map of the game in the app, so even when you're not near your computer, you can log in and see who's winning what.
The app also hooks into your guild's voice chat channel, so you can chat live with friends as you play. It seems like a very impressive second-screen app for the game, so if you're a PlanetSide 2 player, this one's a no-brainer. You can download the PlanetSide 2 Mobile Uplink now.
There is a great looking companion app for android based phones and tablets for DayZ. There are several maps in satelite or topographic for the standalone and mod.
The best part is you can create or join a group through the app and share waypoints, player locations and tent locations.
You can get it here from the Google play store. Hopefully there is one for the iOS that will allow points to be shared through both operating systems.
It looks like you can use it in a browser as well. You could have it open on another monitor as you play and get team player locations graphed in real time.