Tour Guide tutorial

[SteveJG]

You might consider a ringed fence

Location sensor (ringed fence / circular ringed fence)

I do not believe what you tried will work unfortunately. How to tell you if your device is near a destination is either to create a ringed fence and determine whether you are in the polygon of the geocoordinate limits or to calculate your distance from point of interest and when that distance is within certain limits; do something. A simple way to determine how far you are from a destination is described here: Geofence - using the MIT Map and Circle components to define a circular geofence b…

or

Continuously calculate your distance to a particular location like this Calculer la distance entre son domicile et un point donnée dans une textbox - #2 by SteveJG . When the calculated distance is less than 10 meters, you are there You could use a Clock or the LocationChanged event to trigger your calculation.

If you are actually setting Map Markers, you can use some code like

without using an algorithm to calculate distance as Markers have the ability to determine distance to your gps location built in.

Make sure you understand the limitations of using the LocationSensor for determining proximity to a destination (read about Accuracy) in Using the Location Sensor