Most starcharts showing the location of legendary vergences are clever (or not so clever) fakes designed to part foolish treasure hunters from their credits.
More information about the gear available on the Wookieepedia article.
VERGENCE STARCHART[1][]
A vergence starchart (if it is real), shows the location of one vergence (chosen by the GM). To read the chart correctly, the character must make a Hard difficulty Astrogation check with two setback dice. An advantage result on a check can be spent to determine whether or not the chart is real.
- ↑ Nexus of Power: A Sourcebook of Worlds Strong in the Force (Page 106)