Newbie here.
I'm attempting to write an app to assist with setting marker buoys for a yacht race.
I'm comfortable with latitude, longtitude, angles and bearings.
I want to be able to place a second marker on a map a particular distance and bearing away from the first marker.
I can see how to get a distance and bearing of one marker from another that already exists, but i cant see how to set it in the first place.
I've scratched my head for a while now and feel like i'm missing something obvious.
Thanks
The "method" you are after (which uses the haversine formula) is HERE
For background read through the entire topic 
You want the destination point procedure, and supply this with your starting lat/lon, distance and bearing. Once you get your new position, you can set/create a marker for it.
[EDIT] An easier method (though less accurate) would be to work with a live map, tapping at a point on the map to create a new marker, then you could drag the marker to a preferred position. You will want to run a formula or two in the background to return distance/bearings/lat/lon.
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Wow. really - that certainly isnt something obvious.
so the app cant just put a marker 1000mts and 45 degrees away from an existing marker?
thats going to take a bit of studying !
Yep, of course: with a chart, a protractor, a rule and a pencil it is quite straightforward
The procedure block is draggable, so you do not have to re-create it. Click on the image of the block until as big as it can get, then drag it into your open aia project.
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This was also partly an oversight in the design of the components. I think in my original vision for the various map components I was expecting people would be ingesting content from other systems (GIS). I did provide the methods for computing differences between features but not additive methods. We could probably add some "move" methods to the various components to abstract away the calculation.
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This discussion may help too
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