GNSS Log

Vessel centred

SOG—kn

Heading—°T

COG—°T

Turn—°/s

Vx (E)—m/s

Vy (N)—m/s

Position——

Sessions

Test cases recorded on this device

Cloud sync —

Settings

Sensors, display and cloud upload

Appearance

Theme

Speed unit

Plot orientation

Trail length minutes

Heading sensor

Phone mounting

Flat: screen up, top edge toward the bow. Upright: portrait, back camera toward the bow.

Mounting offset ° added to phone heading Magnetic declination ° East + Compass noise ° 1σ for the filter Turn rate smoothing seconds; higher = steadier, slower

Invert gyro yaw only if heading lags turns

Auto-correct compass Learns from GNSS course while running straight

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Cloud upload

Endpoint URL HTTPS, receives JSON POSTs

Auth header Value

Device name sent with each session

Upload automatically

Storage

Used on device —

GNSS Log