calculating distance from gps coordinates

[championx]

Hi! do anyone have calculated distance using GPS coordinates?

It uses some complex math functions, do you have any advice to do this?

thanks

[temtronic]

use integers
do NOT use floating point
search the forum

[newguy]

https://en.wikipedia.org/wiki/Haversine_formula

Definitely use integers. If you're attempting this in a PIC, your accuracy (gut feeling only) isn't going to be on the order of meters or better. What sort of accuracy do you require?

[Ttelmah]

<http://www.ccsinfo.com/forum/viewtopic.php?t=27879&highlight=haversine>

<http://www.ccsinfo.com/forum/viewtopic.php?t=27947&highlight=cordic>

<http://www.ccsinfo.com/forum/viewtopic.php?t=47980&highlight=haversine>

The cordic code _with some added care to handle the quadrants and special cases_, can give great results.