diff options
Diffstat (limited to 'libgpsd_core.c')
-rw-r--r-- | libgpsd_core.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/libgpsd_core.c b/libgpsd_core.c index 306bca13..c6ced73d 100644 --- a/libgpsd_core.c +++ b/libgpsd_core.c @@ -899,9 +899,14 @@ static void gpsd_error_model(struct gps_device_t *session, * expected time error should be half the resolution of * the GPS clock, so we put the bound of the error * in as a constant pending getting it from each driver. - * FIXME: increase this if no leap-second has been seen - * and it's less than 750s (one almanac load cycle) - * from device powerup. + * + * In an ideal world, we'd increase this if no leap-second has + * been seen and it's less than 750s (one almanac load cycle) from + * device powerup. Alas, we have no way to know when device + * powerup occurred - depending on the receiver design it could be + * when the hardware was first powered up or when it was first + * opened. Also, some devices (notably plain NMEA0183 receivers) + * never ship an indication of when they have valid leap second. */ if (isnan(fix->time) == 0 && isnan(fix->ept) != 0) fix->ept = 0.005; |