GPS coördinates

hi,
i'm building copy of frustromantic box http://newbrightidea.com/?p=15

i have 1 question gps location in code.
this part of code

code: [select]

#define earth_radius 6378.1f
#define deg_to_rad 0.0174532925f

#define tofino_lat 49.122444f
#define tofino_lon 125.900871f

#define xxxx_lat 0.0f
#define xxxx_lon 0.0f

#define home_lat 64.0f
#define home_lon 128.0f

i understand earth_radius , deg_to_rad fixed values.
tofino_lat , tofino_lon destination coördinates

but xxx_lat , xxxx_lon mean?
and same home_lat , home_lon?

did try this?

code: [select]

#define xxxx_lat 50.985991f
#define xxxx_lon 5.359998f


and way, if use arduino floating point functions, you're going lose precision. expect small variations read on gps-receiver.

korman

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