Geo URI scheme
The geo URI scheme is a way to define locations using a 2 or 3-dimensional latitude, longitude and optionally altitude parameters.
It allows you to link to a location without linking to a specific platform, letting the user, or user agent (in many cases a browser) choose what platform to display the information.
The geo URI scheme was published by the IETF in June 2010.
The scheme officially supports an optional accuracy parameter (;u=500) using u and the value is accuracy in metres.
The android platform supports some unofficial parameters for zoom levels etc.
See the Wikipedia article for more information https://en.m.wikipedia.org/wiki/Geo_URI_scheme
Platform-dependent support
It is up to the user’s platform (Android, iOS, macOS, Linux) to decide what to do when met with a geo or any other semi-exotic URI protocol.
Not all desktop OS’es support the geo URI scheme.
Apple Maps links like these http://maps.apple.com/?q=Mexican+Restaurant are supposed to work on any platform by using UA-sniffing to send the user to the right service.
There might be some privacy implications using these kinds of links.