typedef struct _VikGpsLayer VikGpsLayer;
gboolean vik_gps_layer_is_empty ( VikGpsLayer *vgl );
const GList *vik_gps_layer_get_children ( VikGpsLayer *vgl );
VikTrwLayer * vik_gps_layer_get_a_child(VikGpsLayer *vgl);
typedef struct _VikGpsLayer VikGpsLayer;
gboolean vik_gps_layer_is_empty ( VikGpsLayer *vgl );
const GList *vik_gps_layer_get_children ( VikGpsLayer *vgl );
VikTrwLayer * vik_gps_layer_get_a_child(VikGpsLayer *vgl);