use it in case of emergency eg.your kid has been kidnapped
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The legality of using a GPS blocker varies by country and region. In some places, it is illegal to use a GPS blocker because it can interfere with communication signals and pose a safety risk. It is important to check the laws and regulations in your area before using a GPS blocker.
keep an eye on convicted criminals.
Yes, the Coast Guard does use an NMEA GPS. It transmits the time, latitude, longitude, number of satellites, altitude, and some other information. http://ruggedbits.wordpress.com/
No, there is no GPS tracking installed on this device.
GPS typically works well on oceans, as long as there is line-of-sight with GPS satellites. However, in some cases, GPS signals may be weaker or unavailable in certain areas due to interference or satellite visibility issues. It's recommended to use a GPS device that supports GLONASS or Galileo in addition to GPS for more accurate positioning on the ocean.