Projecting between two waypoints

[+imajeep]

I'm working a series where the third cache is halfway between the first two. So, to get the coordinates of the third cache, I need to project a waypoint at the midpoint between caches 1 and 2.

 

Any suggestions on software that can do this for me? I haven't seen any web pages with this type of calculation. I am told that GSAK can do it, but I can't find a menu command or macro that fits the bill.

 

If all else fails, I'll sit down with MapSource and use the measurement tool. But I'd rather not do that, because it is rather inexact, and I suspect the cache owner placed #3 at the exact midpoint.

 

Thanks!

[+Thrak]

Too lazy to check to see if it will do what you require but check out FizzyCalc and see for yourself.

[SiliconFiend]

I'm working a series where the third cache is halfway between the first two. So, to get the coordinates of the third cache, I need to project a waypoint at the midpoint between caches 1 and 2.

 

Any suggestions on software that can do this for me? I haven't seen any web pages with this type of calculation. I am told that GSAK can do it, but I can't find a menu command or macro that fits the bill.

 

If all else fails, I'll sit down with MapSource and use the measurement tool. But I'd rather not do that, because it is rather inexact, and I suspect the cache owner placed #3 at the exact midpoint.

 

Thanks!

That's actually a pretty simple math problem. Just convert the coordinates to decimal degrees and take the average of the two components from the two waypoints. In other words, lat3 = (lat1 + lat2)/2, lon3 = (lon1 + lon2)/2. Then you can convert the result back to degrees decimal minutes if needed.

[+imajeep]

I'm working a series where the third cache is halfway between the first two. So, to get the coordinates of the third cache, I need to project a waypoint at the midpoint between caches 1 and 2.

 

Any suggestions on software that can do this for me? I haven't seen any web pages with this type of calculation. I am told that GSAK can do it, but I can't find a menu command or macro that fits the bill.

 

If all else fails, I'll sit down with MapSource and use the measurement tool. But I'd rather not do that, because it is rather inexact, and I suspect the cache owner placed #3 at the exact midpoint.

 

Thanks!

That's actually a pretty simple math problem. Just convert the coordinates to decimal degrees and take the average of the two components from the two waypoints. In other words, lat3 = (lat1 + lat2)/2, lon3 = (lon1 + lon2)/2. Then you can convert the result back to degrees decimal minutes if needed.

 

I thought about that, but I missed the step of converting to decimal degrees. Thanks!