How about a proximity indicator on your phone when you’re close enough to establish a bluetooth beacon etc. Either showing it like “cold, warm, hot” or a series of beeps, varying the frequency the closer you are to the taxi.
NPM says that the latest release is 0.9. Are you installing this on a project with a dependency in package.json at 0.8? Jump on our chatroom (https://gitter.im/searchkit/searchkit) if you cant figure it out!