Only one of Victoria's 300 known arsonists has a GPS tracker on them, and firefighters say that number has to go up.
The United Firefighters Union wants to put the devices on arsonists to stop them lighting deadly and destructive bushfires.
"Any mechanism that prevents them engaging in that activity can only be in the community's benefit," union secretary Peter Marshall told the Herald Sun on Monday.
Victoria Police said it already door-knocks known arsonists during the fire season to let them know officers are about.
"Police conduct intelligence-led patrols of arson fire hot spots, targeting people of interest - of which there are over 300 state-wide," a police statement said on Monday.
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"There is currently one person in Victoria who has a GPS bracelet attached."
Emergency Services Minister Jane Garrett said the GPS tracking device was a relatively new system, and she expects courts and parole boards would increasingly put them on people convicted of arson.
"There's been double the number of people charged with arson in the past year," she told reporters.
"We'll always be talking to Victoria Police about how we can improve ways of dealing with offenders."
Emergency Management Commissioner Craig Lapsley said arson was a mental health issue that needed a mixture of responses.
"I believe that Victoria Police are doing the best they can with the powers they've got," he said.
Under the Corrections Act, the use of GPS tracking devices to monitor high-risk arsonists can only be applied as an extra measure for someone who has a conviction at court.
