Detective Inspector Louise Ludwig said: "We would urge all shoppers to be wary of anyone who might be watching you at the checkout.
"Always cover your PIN when you enter it into a cash machine or Chip & PIN machine at the tills.
"Try to avoid being distracted by people asking for directions, and keep your valuables safe."
Kent Police have revealed details of the following scam incidents.
May 5, sometime between 12 – 1 pm, Tesco, Millstrood Road, Whitstable. Suspect described as light skinned, aged in his 30s, 6ft tall, slim build with dark hair.
May 9, ASDA, Sturry Road, Canterbury, woman went to back of car to help man with the map, passenger door left unlocked, later noticed card missing. Suspect man with tanned European skin, aged in 30s, around 5ft 6 to 5ft 7in tall with thick dark hair.
May 10, 3pm, TESCO, Smallhythe Road, Tenterden, Woman approached by a man and woman asking for directions. As the map was folded out over the top of the trolley she noticed that the woman was unzipping her purse. She told them to go and they fled.
Shoppers in Kent are being warned to be vigilant over a scam.
It follows a number of incidents where people heading to their cars with their shopping in East Kent have been approached by a man asking for directions.
The man gets a map out and engages the victim in conversation to distract them while an accomplice steals their bank card from the passenger seat of the car, or top of the shopping trolley.
It is thought the suspects target their victims at the checkout and make a note of the PIN number entered by the victim into the chip and pin machine when they pay for their shopping.
With the victim’s PIN number they can then use the stolen card to withdraw cash.