problem:
with larger player numbers you draw more locations than you can possibly explore each round, due to the limit of 1 exploration per round. to make the game still playable, ffg added northern tracker who take care of the problem, because they can discard any number of locations from the staging area.
it's a bad fix in my oppinion because it causes the following problems:
1. northern trackers are absolutely required to win scenarios with certain player numbers. for the gollum expansion scenario it seems you even need them in 2 player games.
2. with northern trackers, the abilities of locations become obsolete, because you are just discarding them from staging area anyways. i often caught myself not even reading the effect on locations anymore, because i knew i won't travel to them anyways.
both points are a major issue for me. 1. because no single card should be absolutley required (it's not the case with any other card). and 2. because travel and persistent effects on locations are really cool, thematically as well as mechanically.
so here's my suggested fix:
A. The players may travel to multiple locations during travel phase.
B. There may be one active location for each player. If there are multiple active locations with less progress markers than quest points, the start player decides on which location progress markers are placed.
C. Only active locations may be discarded as explored, and this is only possible between the quest and the travel phase.
this means you cannot discard any location without triggering its "travel" effect, and you have the persistent effect active for at least one round. northern trackers can still scout the locations for you in advance, but you have to actually travel there in order to fully explore them.
i created a rules card, to be used with my custom scenarios, that shows this. but it can as well be used with any other scenario:
http://www.boardgamegeek.com/image/1054832/the-lord-of-the-rings-the-card-game