It is often found with this meaning on maps.
Common word: 至少 zhìshǎo 'at least'
致 is also zhì and means 'devote etc.':
Common word: 大致 dàzhì 'roughly'
In In Sending a parcel at the post office it it is used like this:
大致估一个写了吧 dàzhì gū yí ge xiěle ba ‘have a rough guess at one (i.e. the weight) and write it’