Sounds like they might be using radio emissions to lock in on locations. The Russians are good at radio direction finding.
The Russians must be mapping out the locations from Ukraine Regular command and control radio traffic. Is Ukraine using effective communication setups or off the shelf Baofeng radios?
They have located targets supported by Western advisors in the past by simply following cell phones
By now I assume foreign mercenaries and advisors have been alerted to not turn on their phones with Euro and US country codes
“Sounds like they might be using radio emissions to lock in on locations. The Russians are good at radio direction finding.”
HIMARS is 100% digital. All the info for a fire mission is sent via burst transmission lasting milliseconds