You should be able to create a voice navigation system for desktop users in open source environment or using google maps API (similar to what navigation apps do, but with the capability to work on desktop computers). The location coordinates are from a separate GPS device, so imagine it is available to the program through an API.
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Hello... I am highly interested to do your project. Relevant Skills and Experience I have full experience of using voice API please contact me Proposed Milestones $150 USD - complete