Tpa panel, This panel would act as a tpa command for the TARDIS, It would Allow you to request to send your TARDIS to somebody's location While not giving away the coordinates, Maybe  a reverse effect that allows the player to teleport to Another player's TARDIS, Like tpaask,  Based off the removed Tpa command from DMU, as long as the Player locate panel from 1.12, My friend SeaPandabear uploaded this same suggestion On the discord Because im not fully logged into discord, Thought it'd be good to post it here Aswell,                     EDIT: The panel could be a alternate of the Dimension panel But instead of dimensions You get player heads, Perhaps using the same code as the server player list on the menu screen if possible, The buttons would act the same and the middle button would send the request. Of course this would not automatically send the tardis Nor send the coords unless the request was Accepted.

Much like  the plasyer locator  from  1.12.2 . this would resolve people's issues in finding there friends and it shoulkd be linked with a command play /tardistpa accept

alternatively to not have a command for it you could have an item someone must craft for a tardis to find them some kind of transmitter so players dont need to worry about random people finding them. if you shift click to toggle state then you can have a way for a player not to be found even with the item and then can turn it back on when needed 

Ye like a transmat beam instead!

I think this is a great idea! I hope it is added!