inav/docs/OSD.md

On Screen Display

The On Screen Display, or OSD, is a feature that overlays flight data over the video image. This can be done on the flight controller, using the analogue MAX7456 chip. Digital systems take the OSD data, via MSP DisplayPort, send it to the video receiver; which combines the data with the image. You can specify what elements are displayed, and their locations on the image. Most systems are character based, and use the MAX7456 analogue setup, or MSP DisplayPort. However, there are some different systems which are also supported. Such as the canvas based FrSKY PixelOSD on analogue. Canvas OSDs draw shapes on the image. Whereas character based OSDs use font characters to display the data.

Features and Limitations

Not all OSDs are created equally. This table shows the differences between the different systems available.

OSD System	Character grid	Character	Canvas	MSP DisplayPort	All elements supported
Analogue PAL	30 x 16	X			YES
Analogue NTSC	30 x 13	X			YES
PixelOSD	As PAL or NTSC		X		YES
DJI OSD	30 x 16	X			NO - BF Characters only
DJI WTFOS	60 x 22	X		X	YES
HDZero	50 x 18	X		X	YES
Avatar	53 x 20	X		X	YES
DJI O3	53 x 20 (HD)	X		X (partial)	NO - BF Characters only

OSD Elements

Here are the OSD Elements provided by INAV.

ID	Element	Added
0	OSD_RSSI_VALUE	1.0.0
1	OSD_MAIN_BATT_VOLTAGE	1.0.0
2	OSD_CROSSHAIRS	1.0.0
3	OSD_ARTIFICIAL_HORIZON	1.0.0
4	OSD_HORIZON_SIDEBARS	1.0.0
5	OSD_ONTIME	1.0.0
6	OSD_FLYTIME	1.0.0
7	OSD_FLYMODE	1.0.0
8	OSD_CRAFT_NAME	1.0.0
9	OSD_THROTTLE_POS	1.0.0
10	OSD_VTX_CHANNEL	1.0.0
11	OSD_CURRENT_DRAW	1.0.0
12	OSD_MAH_DRAWN	1.0.0
13	OSD_GPS_SPEED	1.0.0
14	OSD_GPS_SATS	1.0.0
15	OSD_ALTITUDE	1.0.0
16	OSD_ROLL_PIDS	1.6.0
17	OSD_PITCH_PIDS	1.6.0
18	OSD_YAW_PIDS	1.6.0
19	OSD_POWER	1.6.0
20	OSD_GPS_LON	1.6.0
21	OSD_GPS_LAT	1.6.0
22	OSD_HOME_DIR	1.6.0
23	OSD_HOME_DIST	1.6.0
24	OSD_HEADING	1.6.0
25	OSD_VARIO	1.6.0
26	OSD_VARIO_NUM	1.6.0
27	OSD_AIR_SPEED	1.7.3
28	OSD_ONTIME_FLYTIME	1.8.0
29	OSD_RTC_TIME	1.8.0
30	OSD_MESSAGES	1.8.0
31	OSD_GPS_HDOP	1.8.0
32	OSD_MAIN_BATT_CELL_VOLTAGE	1.8.0
33	OSD_SCALED_THROTTLE_POS	1.8.0
34	OSD_HEADING_GRAPH	1.8.0
35	OSD_EFFICIENCY_MAH_PER_KM	1.9.0
36	OSD_WH_DRAWN	1.9.0
37	OSD_BATTERY_REMAINING_CAPACITY	1.9.0
38	OSD_BATTERY_REMAINING_PERCENT	1.9.0
39	OSD_EFFICIENCY_WH_PER_KM	1.9.0
40	OSD_TRIP_DIST	1.9.1
41	OSD_ATTITUDE_PITCH	2.0.0
42	OSD_ATTITUDE_ROLL	2.0.0
43	OSD_MAP_NORTH	2.0.0
44	OSD_MAP_TAKEOFF	2.0.0
45	OSD_RADAR	2.0.0
46	OSD_WIND_SPEED_HORIZONTAL	2.0.0
47	OSD_WIND_SPEED_VERTICAL	2.0.0
48	OSD_REMAINING_FLIGHT_TIME_BEFORE_RTH	2.0.0
49	OSD_REMAINING_DISTANCE_BEFORE_RTH	2.0.0
50	OSD_HOME_HEADING_ERROR	2.0.0
51	OSD_COURSE_HOLD_ERROR	2.0.0
52	OSD_COURSE_HOLD_ADJUSTMENT	2.0.0
53	OSD_SAG_COMPENSATED_MAIN_BATT_VOLTAGE	2.0.0
54	OSD_MAIN_BATT_SAG_COMPENSATED_CELL_VOLTAGE	2.0.0
55	OSD_POWER_SUPPLY_IMPEDANCE	2.0.0
56	OSD_LEVEL_PIDS	2.0.0
57	OSD_POS_XY_PIDS	2.0.0
58	OSD_POS_Z_PIDS	2.0.0
59	OSD_VEL_XY_PIDS	2.0.0
60	OSD_VEL_Z_PIDS	2.0.0
61	OSD_HEADING_P	2.0.0
62	OSD_BOARD_ALIGN_ROLL	2.0.0
63	OSD_BOARD_ALIGN_PITCH	2.0.0
64	OSD_RC_EXPO	2.0.0
65	OSD_RC_YAW_EXPO	2.0.0
66	OSD_THROTTLE_EXPO	2.0.0
67	OSD_PITCH_RATE	2.0.0
68	OSD_ROLL_RATE	2.0.0
69	OSD_YAW_RATE	2.0.0
70	OSD_MANUAL_RC_EXPO	2.0.0
71	OSD_MANUAL_RC_YAW_EXPO	2.0.0
72	OSD_MANUAL_PITCH_RATE	2.0.0
73	OSD_MANUAL_ROLL_RATE	2.0.0
74	OSD_MANUAL_YAW_RATE	2.0.0
75	OSD_NAV_FW_CRUISE_THR	2.0.0
76	OSD_NAV_FW_PITCH2THR	2.0.0
77	OSD_FW_MIN_THROTTLE_DOWN_PITCH_ANGLE	2.0.0
78	OSD_DEBUG	2.0.0
79	OSD_FW_ALT_PID_OUTPUTS	2.0.0
80	OSD_FW_POS_PID_OUTPUTS	2.0.0
81	OSD_MC_VEL_X_PID_OUTPUTS	2.0.0
82	OSD_MC_VEL_Y_PID_OUTPUTS	2.0.0
83	OSD_MC_VEL_Z_PID_OUTPUTS	2.0.0
84	OSD_MC_POS_XYZ_P_OUTPUTS	2.0.0
85	OSD_3D_SPEED	2.1.0
86	OSD_IMU_TEMPERATURE	2.1.0
87	OSD_BARO_TEMPERATURE	2.1.0
88	OSD_TEMP_SENSOR_0_TEMPERATURE	2.1.0
89	OSD_TEMP_SENSOR_1_TEMPERATURE	2.1.0
90	OSD_TEMP_SENSOR_2_TEMPERATURE	2.1.0
91	OSD_TEMP_SENSOR_3_TEMPERATURE	2.1.0
92	OSD_TEMP_SENSOR_4_TEMPERATURE	2.1.0
93	OSD_TEMP_SENSOR_5_TEMPERATURE	2.1.0
94	OSD_TEMP_SENSOR_6_TEMPERATURE	2.1.0
95	OSD_TEMP_SENSOR_7_TEMPERATURE	2.1.0
96	OSD_ALTITUDE_MSL	2.1.0
97	OSD_PLUS_CODE	2.1.0
98	OSD_MAP_SCALE	2.2.0
99	OSD_MAP_REFERENCE	2.2.0
100	OSD_GFORCE	2.2.0
101	OSD_GFORCE_X	2.2.0
102	OSD_GFORCE_Y	2.2.0
103	OSD_GFORCE_Z	2.2.0
104	OSD_RC_SOURCE	2.2.0
105	OSD_VTX_POWER	2.2.0
106	OSD_ESC_RPM	2.3.0
107	OSD_ESC_TEMPERATURE	2.5.0
108	OSD_AZIMUTH	2.6.0
109	OSD_CRSF_RSSI_DBM	2.6.0
110	OSD_CRSF_LQ	2.6.0
111	OSD_CRSF_SNR_DB	2.6.0
112	OSD_CRSF_TX_POWER	2.6.0
113	OSD_GVAR_0	2.6.0
114	OSD_GVAR_1	2.6.0
115	OSD_GVAR_2	2.6.0
116	OSD_GVAR_3	2.6.0
117	OSD_TPA	2.6.0
118	OSD_NAV_FW_CONTROL_SMOOTHNESS	2.6.0
119	OSD_VERSION	3.0.0
120	OSD_RANGEFINDER	3.0.0
121	OSD_PLIMIT_REMAINING_BURST_TIME	3.0.0
122	OSD_PLIMIT_ACTIVE_CURRENT_LIMIT	3.0.0
123	OSD_PLIMIT_ACTIVE_POWER_LIMIT	3.0.0
124	OSD_GLIDESLOPE	3.0.1
125	OSD_GPS_MAX_SPEED	4.0.0
126	OSD_3D_MAX_SPEED	4.0.0
127	OSD_AIR_MAX_SPEED	4.0.0
128	OSD_ACTIVE_PROFILE	4.0.0
129	OSD_MISSION	4.0.0
130	OSD_SWITCH_INDICATOR_0	5.0.0
131	OSD_SWITCH_INDICATOR_1	5.0.0
132	OSD_SWITCH_INDICATOR_2	5.0.0
133	OSD_SWITCH_INDICATOR_3	5.0.0
134	OSD_TPA_TIME_CONSTANT	5.0.0
135	OSD_FW_LEVEL_TRIM	5.0.0
136	OSD_GLIDE_TIME_REMAINING	6.0.0
137	OSD_GLIDE_RANGE	6.0.0
138	OSD_CLIMB_EFFICIENCY	6.0.0
139	OSD_NAV_WP_MULTI_MISSION_INDEX	6.0.0
140	OSD_GROUND_COURSE	6.0.0
141	OSD_CROSS_TRACK_ERROR	6.0.0
142	OSD_PILOT_NAME	6.0.0
143	OSD_PAN_SERVO_CENTRED	6.0.0