When charging UPS, does it have to be turned on?

No it is not necessary for any new ups’ to become switched up on keep these charging, they just continue charging in the event that kept pluggen with on, switching on ways that your computer wont cover, it will work when the energy is decrease!

some ups charged when power supply exist and the energy switch on the ups will be on(like concerning one connected with wipro), but a number of ups like apc is usually charged with only rocked the wire and make it possible for the swap remain on, you dont have to switch to the ups.

Read this manual.

You indicate GPS.