if all they are interested in is your location what about just using the Find My iPhone app?
Apple Find My Friends is by far the best option if you have an iPhone. Strava live track empties your phone battery, as does the Garmin Live Track (when it works as it's 50/50 if it'll drop during your ride).
@mattyc started
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if all they are interested in is your location what about just using the Find My iPhone app?