This is a simple Data Broker plugin that will allow you to call out your position over battleground chat. For example left-clicking will say over battleground chat "Incoming Gold Mine". Also, by right-clicking you will say over battleground chat "Gold Mine is clear."
It should work with any Data Broker display addon. AddonLoader support is also included.
This is a very simple addon that fits my needs very well so it's doubtful I'll add any features but suggestions are welcome.