JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Currently, we have a widget called "Geolocation" and it shortens the process. All you need to do is add widget to your form and if you want to set custom location, you can copy and paste the longitude and the latitude value in "Default Location" text box.
Please, see it from the below:
If you need any extra information, please let us know.