[crubier]

Possibly even just

    waypoint = waypointsMatches[0]

Without even mentioning that waypointsMatches might have multiple elements.

This is why I always consider [0] to be a code smell. It doesn't have a name afaik, but it should.

[CaptainFever]

Silently ignoring conditions where there are multiple or zero elements?

[gopher_space]

Race condition?