15: Position

When setting up of changing a SUBSCRIpition, particularly intervals <= 1000, the GNSS module may need to reboot to apply the changes, and it may take time to get a fix.

Header

Field	Name	Description	Type
5	Method	Request a service to be perform an action Possible values: 1: SET— Set one or more values that are provided in the message payload. 2: GET— Get values for the associated message type. 3: SUBSCRIBE— Subscribe to values for the associated message type. Can be used in conjunction with other header fields to define the subscription parameters, such as Interval, Duration, Timeout, Storage Level and Message Level. If no interval is provided, messages will be sent as and when new data is available. Some data, such as GPS position, may require a set interval to be provided. 5: UNSUBSCRIBE— Unsubscribe from a previous subscription.	uint8

This is an extract of header fields that are relevant to this message type, you can find them all documented in the Headers section.

Payload

Field	Name	Description	Type	Unit
1	Timestamp	Timestamp of when the position was taken May be invalid if the GPS has not locked in yet (when type is 'invalid')	uint64	ms since epoch
2	Latitude		int32	× 1e7 = degree
3	Longitude		int32	× 1e7 = degree
4	Altitude	Altitude	int32	× 1e3 = meter
5	Accuracy	Accuracy	uint16	cm × 1e2 = meter
6	Course	Course over ground	uint16	× 1e2 = degree
7	Speed	Speed	uint16	× 1e2 = km/h
8	Satellites		uint8	count
9	CN0	Average CN0. Carrier to noise density. Higher is better.	uint8	dB-Hz
10	Type	Position type Possible values: 0: invalid 1: fixed 2: reserved— Can indicate a 2D fix, low accuracy, should be treated as invalid 3: standalone— standalone 3d fix 4: rtk-float 5: rtk-fix	uint8
11	Source	Position source Possible values: 0: gps— Position has come from a GPS module. 1: rtk— Position has come from an RTK module. This does not mean the position is RTK corrected.	uint8
12	Correction Age	Age of the correction data (RTK or DGNSS) from NMEA GGA sentence	uint8	× 10 = seconds

Examples

RTK fix position (1cm accuracy)

📡 Real example from RV1 P1 v2287 on 2025-10-03This example is captured from an RV1 device as part of normal communications with the cloud, somewhere in California.

Subscription request

📡 Real example from Lightbug cloud forwarding system on 2025-10-24This is a real message recorded from the lightbug cloud forwarding system, sent to an RH2 device

Code

For convenience, the following constants can be used to reference this message type.