[jogosub]

Mirrors with compass are available on eBay - same brand that Subaru outsourced for their OEMs (Gentex). I have upgraded my previous 2 Subarus with those because I wanted to have the 2 built in map reading spot lights on bottom of the rear view mirrors. They can be used by passenger for reading without distraction to the driver.

 

[jogosub]

Pick the one you like and send a message to the selling vendor for fitment.
Basically, they all fit with the universal plug-n-play ... plug is under the headliner.
I bought one for my 2010 Forester and it worked fine....and one for my 05 Forester ... I think Amazon sells them as well... as you probably know, they have risk free return policy, if it doesn't work. Just ignore their "will it fit my car" section; for obvious reasons they always say that it does not....while it actually fits!

 

[jogosub]

It does have a compass on main NAV screen. After you tap on "I agree" and the map comes up, the top center of the map screen will show the heading. If you tap on that it will show you the "Where am I" position coordinates, etc.
How accurate that position is - that is another question. You can double check with your extra Garnmin (if you have one) or iPhone/Droid phone ...

 

[jogosub]

This one fits... BTW - Gentex also makes rear view mirrors for Subaru and Subaru calls them OEM...LOL

Amazon.com: Gentex GENK45AM Auto-Dim Mirror with Compass and Homelink® for Subaru: Automotive

 

[jogosub]

As long as you have the correct plug that will fit into a socket under the headliner with 3 pins (for plug-n-play installation) and the window bracket fits the (basic) replacement mirror, you are fine. Basic = auto dimming and compass.
If the mirror window bracket does not fit (due to mirror twist on/off bracket), all you need then is to order the right bracket; i.e. P/N H501SSA040 - and attach it to the twist on/off bracket.

As far as I know, Subarus just have 2 types of window mirror brackets; one that twists on/off the rear view mirror and one that slides on/off on above mentioned bracket.

Some older Subarus come with plain "manual" dimming rear view mirrors, without a compass. If you look under the headliner (by removing dome/map light assembly cluster) and find an empty 3 pin socket there - bingo - you can add Subaru auto dimming mirror with compass then. Either P/N H501SAG200 or P/N H501SFJ001.

I have done it many times... not just on Subarus...