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"New app! A compass that points to the centre of the galaxy"
(interconnected.org)
This is a most excellent place for technology news and articles.
Yea unfortunately I couldn't try it myself, but the write-up was fun
Waiting for someone to make a FOSS one for Android
You can just use Sky Map and search for Sagittarius.
What you actually want to search for is Sagittarius A*, but Sky Map doesn't have that, so the Sagittarius constellation is close enough to give you the general direction.
RA 17h 45m 40.0409s, dec −29° 0′ 28.118″
Here's a map: https://www.eso.org/public/images/eso1835b/