A man caught driving the wrong way on a Victorian highway has told police he was following instructions from his GPS unit.

The 37-year-old was pulled over after travelling down the Hume Freeway between Clonbinane and Broadford, in central Victoria, around 4:30am AEDT.

The New South Wales man told police he had referred to his GPS for the 20-kilometre journey.

He said he was unconcerned by passing traffic because he thought he was on a dual carriageway.

Last week, Mildura police issued a warning about relying on devices that use online maps.

Authorities have rescued six people from the Murray Sunset National Park over the past two months due to inaccurate data.

Meanwhile, another New South Wales driver had his car impounded after being caught doing 177 kilometres an hour on the Hume Freeway last night.

The 17-year-old P-plater told police he was speeding because his car was running out of petrol.