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I am working on a project that includes a GPS signal. In my electric diagram, do I have to add it? I don't know which is the symbol for that.

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    \$\begingroup\$ Are you talking about a GPS receiver? The symbol for that would be an antenna feeding into a box labelled "GPS module" or whatever level of granularity you want to use in your design. \$\endgroup\$ – Hearth Apr 11 at 15:17
  • \$\begingroup\$ Unless you are doing radio signal analysis there should be no reason to add a symbol that represents the signal. The module/antenna is fine, maybe with a note that this is a GPS antenna. \$\endgroup\$ – Ron Beyer Apr 11 at 15:20
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Nobody can force you to add a specific symbol to your schematic. So, no, you don't have to add it. The purpose of a schematic is to be clear and descriptive, not to be advertisement material.

I don't even know whether GPS has a symbol. NAVSTAR/GPS does have something like a coat of arms, but it's not an "official logo". After all, GPS is a US government program and not a profit-oriented enterprise.

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