Hi there, i want to offer online food ordering service, and i have the address list of those restaurants where they are located in difference places. The question is, when a customer input their own address, how can we compare the customer's address with our restaurant database, and give out the closest restaurant available in terms of direct distance between two points?

Thanks a lot

Sam

This is a great utility; but are the results given in true bearings or magnetic?

Hi, this is great utility, but is there an error in bearing calculation? No matter how short the distance is, the bearing difference between points A and B is at least one degree. My guess is that there is systematic error of one degree in the one end or another.

Cheers,
JP

JP, thanks for noticing this error. It is now fixed.

how to locate the four points on google map and how to connect those points with each other so that we may print it.
for example:the distance between four sets of longitudes and latitudes coordinates result in four different points, how we can locate those four points on map.

Magnetic North declination in the UK is approximately 1.5 deg West.
Discovered this trying to set up a TV aerial in the direction of the transmitter(s). Great site - you can look up the Post codes of the local TV transmitters on line. Put in your own and get a bearing for pointing the aerial.

why can I not save this to file after I have made a distance calculation. I particularly need the map in *.jpg format

Does anyone know if the bearings given include local declination? From Peter Calver's comment, I'm guessing not.

Hi,

Found this site about a month back and thought brilliant - just what I have been looking for.

However I have just come to use it again over the past few days and after the initial route and bearing between two entered locations (which still works perfectly) clicking on a point on the map to re-set a location A or B comes back with undefined co-ordinates?

I have tried several PC's, Vista, XP and IE9, IE8, Chrome and FireFox and they all do the same?

Any thoughts?

Pete

Please have the option to use degrees,minutes, and seconds instead of decimal degrees. all my equipment set up this way hard to have to convert every time I use this. thanks Mike ray

Hi,

Am I the oly one that this stopped working for a couple of years ago?

It was brilliant and I would pay money for it but after the first calculation and display on the map selecting another point by clicking on the map and for example changing this to be location B just generates an undefined location error?

As I mentioned before this stopped woring on all browsers I have, i.e. latest versions of IE Chrome, Firefox and on a varietry of OS's XP, Vista, Win 7, Win 8.1.

It would be wondeful to have this back working :)

Regards,

Pete

Pete,

The problem is now fixed.

The map is now using Google Map Api v3 instead of the old v1 version.

Hi Robert,

I just tried it and it worked and thought wow - then I saw your comment.

If nobody else appreciates your effort, I for one am ecstatic to have this back working.

Many, many thanks for reading my comment and of course fixing it :)

Regards,

Pete

Hi, Is there a way to store Location A Latitude and Longitude data?

Why not just give magnetic bearings. From a compass, London is not setting at 45'! which is correct my compass or your program?

Magnetic readings are NOT accurate and are off by deferent amounts depending on where you are on the earth because the earths magnetic field is NOT uniform all over the world. Better accuracy is obtained by using great circle readings. Magnet bearings are only good for short distances. Your compass will be off because of the large distance to London and also the magnetic declinations at your location.

Is there a way to get the topography between 2 points along the direction (for radio wave propagation) or to use UK Grid Reference points instead of having to translate to lat. and lon.

This is a fantastic product. Is it available as an Andoid based tool so I can use it when unable connect internet. I'd happily pay for it. Rob

I do not understand what "true bearing" means. Can you explain this? What I am looking for is basically an antenna pointer, so I need something that says, Buffalo NY lies at 120 degrees from Hamilton ON

I am still seeing the one degree bearing distance issue.
It does not appear to be fixed.

This has proven useful to find the shortest distance between points in the world. Using that information you can point your receiving antenna towards the broadcaster's antenna if you listen to shortwave and have a loop antenna on a rotor which is very directional.
Steve Sybesma from Brighton, CO.

Craig,
You just want to pay attention to direction A because that's the direction from the starting point, assuming that is where you are.
From where you are calculating from, the destination is in direction A.
Direction B is only useful to know what your final direction is as you are arriving at the destination, because your direction slowly changes as you travel along the geodesic curved line. If someone at the destination wants to know what direction to point their antenna to you, it would be the value of your direction B plus or minus 180 degrees.
Steve Sybesma in Brighton, CO.

Hello Jim,
How are you testing this?
The only way to truly test this is to calculate to a destination that is known to be directly due north or due south of you.
Your tested direction A result should end up either 0/360 or 180.
If it's still a degree off then, you will know there is a problem.
To determine accuracy, don't pick either too short a distance or the antipode of where you are now as a destination because all directions to an antipode will be the shortest distance to that point. Ideally, the best possible accuracy test would be to pick a destination that is 90 degrees of latitude north or south of where you are. If you find a discrepancy then, it needs to be fixed.
(Yes, that will in at least one of those cases put you in the opposite hemisphere.)
Doing the test this way avoids the problem of the shortest straight line distance gradually changing its direction due to a curved line veering away from a line of latitude.
The reason for due north or south and not east or west, is because calculating any other directions will force the program to calculate a geodesic since you are not at the equator. If you were at the equator, you would then be able to calculate due east or west in addition to due north or south, but never any other direction.
Steve Sybesma in Brighton, CO.

Assumption, all geographic locations are correctly matched to the same LAT/LONG coordinates on all sites that show this information.

Test...calculate direction 90 degrees due north and due south of one's location to find accuracy of orthodrome direction calculation. (There is no other way I know to easily test this.)

LOCATION A: 39.9726732 / -104.8104424

Brighton, CO USA

DESTINATION IS 90 DEGREES DUE SOUTH

LOCATION B: -50.0273268 / -104.8104424

(destination: about 18 degrees longitude east of spacecraft cemetery Point Nemo in the South Pacific)

The program calculates direction correctly (predictably):

(Direction A and B are both calculated due south 180 degrees.)

This would also work with 90 degrees north (going past North Pole and arriving in eastern hemisphere near 50 north.

LOCATION B: 50.0273268 / 75.1895576

(destination: somewhere in NE Kazakhstan)

The program again calculates direction correctly (predictably):

(Direction A is calculated due north 0 degrees and Direction B is calculated due south 180 degrees.)

Steve Sybesma in Brighton, CO.

Hi,
not sure if it can be changed, but the headings seem to always be in integer degrees. is there a way to get decimals behind the decimal point for the heading? two decimals would be very helpful.
thanks,
Don