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If it is possible? Any devices that can be bought to do so. If not, how are GPS satellites are designed to be spoof-free.

Hosam Amleh
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Yes, it's possible — even easy. No, GPS satellites are not designed to be spoof-free.

GPS wasn't designed against satellite spoofing, probably because back then they didn't even dream of someone doing that. Even back in 2008, this wasn't something easy and affordable. From Wired: Researchers Demonstrate How to Spoof GPS Devices:

Researchers at Virginia Tech and Cornell University spent more than a year building equipment that can transmit fake GPS signals capable of fooling receivers.

Since then, this has become easier. All you need is a radio signal transmitter and some open-source software. See e.g. GPS Spoofing w/ BladeRF from Crazy Danish Hacker.

Kaspersky's article on Is it possible to guard against GPS attacks? explains how this is not something that could be easily fixed:

Although the problem has been known for some time, there is a major obstacle to developing protection measures — the key equipment is in space and will not be replaced right away. GPS satellites emit what they emit, and no one can add standard protection tools, such as encryption and certificates, to the signals. Security measures so far have been more experimental in nature and not for large-scale application.

Esa Jokinen
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  • Thank you so much – Hosam Amleh May 07 '20 at 04:40
  • @HosamAmleh Please don't forget to mark the answer as accepted –  May 07 '20 at 07:41
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    Additionally, it is alleged that [Iran stole a US spy drone with GPS spoofing](https://www.wired.com/2011/12/iran-drone-hack-gps/). They (allegedly) jammed its standard communications channel and it failed over to flying home using GPS, which they spoofed, so it landed nice and neatly on a designated Iranian landing strip. – Adam Katz May 07 '20 at 17:57
  • It currently does have anti-spoofing but it is military only (the US and US Allies) and not available in the civilian market. – Brian May 07 '20 at 20:09