Hi guys...wonder if you can help...

I need to do the following:

1) Click on the Map...then it plots marker A

2) Then get the coordinates from marker A and plot a new Marker B
315meters to the West

3) Marker B is to be plotted using marker A (ideally)


I am stuck on how to do part 2. How do i derive the coordinates of
marker B?


I have seen the harvesine formula

Haversine formula:

R = earth’s radius (mean radius = 6,371km)
Δlat = lat2− lat1
Δlong = long2− long1
a = sin²(Δlat/2) + cos(lat1).cos(lat2).sin²(Δlong/2)
c = 2.atan2(√a, √(1−a))
d = R.c


The problem with this is...i only have the value of 1 coordinate

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