With the introduction of Diadem, this feature is even more sorely needed (and should be integrated with the <pos> command).

It's very cumbersome to try to tell your party members where you are in Diadem when there are some islands near the "top" of the playfield, while other islands are near the "bottom"; the worst case is when there are islands floating above other islands. Implementing an altimeter and integrating it with the <pos> command would help alleviate this problem, as well as making it easier to locate /shouted destinations for star-ranked pops.