gps-wizard

OAO - “OnAndOn” Binary

GNSS Frames - 0x0AD4 and 0x0AD5

This format is generated by the Motion GPS (Mini, LCD and USB) and ESP-GPS.

The majority of the data originates from the NAV-PVT (navigation position velocity time solution) message.

OAO Name Raw Name Type Name Type Units Resolution
Latitude latitude <i4 lat float64 deg 1 x 10-7
Longitude longitude <i4 lon float64 deg 1 x 10-7
Altitude MSL altitude_msl <i4 ele float64 m 1 x 10-3
Speed speed <u4 sog float32 m/s 1 x 10-3
Course course <u4 cog float32 deg 1 x 10-3
UTC Time utc_time <u8 ts float64 s 1 x 10-3
Fix fix u1 fix uint8 - -
Satellites satellites u1 sat uint8 - -
Speed Accuracy speed_accuracy <u4 ehve float32 m/s 1 x 10-3
Horizontal Accuracy horizontal_accuracy <u4 ehpe float32 m 1 x 10-3
Vertical Accuracy vertical_accuracy <u4 evpe float32 m 1 x 10-3
Heading Accuracy heading_accuracy <u4 ece float32 deg 1 x 10-3
Horizontal DOP 1 2 hdop <u2 hdop float32 - 1 x 10-2

Notes:

  1. Horizontal dilution of precision (HDOP) originates from the NAV-DOP message.
  2. OAO files produced by the ESP-GPS record PDOP in the HDOP field.

Firmware Details

Changes to the OAO header, since the documentation at Motion-GPS.com.

Previously:

best_t    bests_gybe_min  [5];
uint32_t  elevation_gain;

Nowadays:

best_t    bests_gybe_min  [5];
uint32_t  elevation_gain;

best_t    bests_over_2s  [5];

uint16_t  firmware;
int16_t   timezone;
uint8_t   frequency;
uint8_t   one_log_per_day;

TODO

Thoughts:

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