No! The geolocation on the channel islands (as indicated by google) is very heterogeneous. It does not seem to recognize zip codes, for example.
My company is based on jersey. On our site, we attach the user, and then place on the map a marker where we think. We set this marker to “draggable” and allow the user to drag the marker to its location if it is inaccurate. You can get information about how exactly you found someone from the API - if he is not good enough, you can give additional hints to tell the user to find themselves.
This is not an ideal solution, but it is important to have it - geolocation services do not work exactly around the world.
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