The ultimate weapon to refuse location tracking? The forbidden gadget called a GPS blocker

Device that blocks tracking "GPS Blocker (GPS Jammer)"

Have you ever heard of this term?
This is a device that interferes with the GPS signals received by smartphones, car navigation systems, etc., to prevent the current location from being identified.

Many products are shaped like USB memory sticks, and there are types that plug into a car's cigarette lighter socket as well as portable types that can be carried around. When powered on, they interfere with GPS reception within a range of several meters to over ten meters, causing map apps, tracking tags, vehicle management systems, and the like to "lose the current location."

In fact, many such products are sold on overseas online shopping sites

For example,

searching with keywords like

"GPS Jammer," "GPS Blocker," "Mini GPS Jammer," "Anti Tracking Device"

makes it easy to find them on online shopping sites such as Amazon, AliExpress, Banggood, and DHgate.

Many are priced at a few thousand yen and do not look particularly suspicious.

However, please be careful. In Japan, using these devices may violate the Radio Law.

The reason is,

acts that intentionally interfere with wireless communication are strictly regulated as "illegal radio stations"

In fact, there was a case where a business was raided for using such a device to disable a GPS-equipped heavy machinery theft prevention device.

Also,
there are cases where individuals were prosecuted for using them as a countermeasure against stalking.

GPS signals are transmitted from artificial satellites and are very weak.
Therefore, simply emitting noise on the same frequency band at close range can easily interfere with reception. Jammers use this property to transmit noise signals on GPS frequency bands (such as the L1 band), making reception itself impossible.

By the way, when you think of "spaces where GPS does not reach," many might imagine movie theaters or concert halls.
Previously, this was attributed to building structure or location, but nowadays, in addition to that, more facilities have introduced cell phone suppression devices (cell blockers).

These devices intentionally create an environment where cell phone signals are hard to reach by emitting very weak interfering radio waves on specific frequency bands.
However, installation requires permission from the Ministry of Internal Affairs and Communications and is legally used only in limited facilities such as theaters, concert halls, and certain hospitals. Individuals cannot install or use them on their own.

So,

what legal methods are there to avoid tracking by GPS?

For example,

turn off location information in smartphone settings

use airplane mode

store the device in a Faraday pouch (signal-blocking pouch)

and so on.

These are practical methods to block signals without violating the law.
Of course, using highly anonymous smartphones like AntiSpyPhone that block location information transmission at the OS level is also an effective measure.

GPS blockers may indeed appear as attractive gadgets in spy movies.

However, in reality, their use carries legal risks.

To protect privacy, it is wiser to choose legal and realistic methods.

Referring to communication-blocked spaces like movie theaters, why not try to manage your location information safely in a way that suits you?