Chart and 3D Views Are Wrong


Tip: If the position of the trawl is wrong, open the control panels and click Reset Trawl Position in Trawl Modeling data.

The trawl is placed incorrectly

The positioning settings may be incorrect.

From Scala2, click Menu > Expert Mode .
Right-click the IP address of the receiver at the bottom of the page, then click Configure Receiver.
From the left side of the screen where the system is displayed, click Positioning.
Check that the settings are correctly completed. See Configuring the Positioning Settings

There is no trawl on Scala2, MaxSea or Olex

Trawl settings may be incorrect.

Open the control panels and check from the Trawl data that you see data in Doors Positioning.
Click Menu > Settings > Trawl.
Check that Headline (H), Bridle (B) and Sweepline (S) dimensions are completed according to your trawl model.

There is no trawl or vessel

You may have no GPS coordinates or heading data.

Open the control panels, then go to NMEA Inputs and check that you receive GPS coordinates and heading data.
If not, check you have correctly configured the NMEA input(s): Adding Data from External Devices.

The trawl seems shrunken

Bearing angles may be incorrect.

Check the baseline dimensions you entered in the positioning settings in the system web page (or Scala2 receiver page).

The vessel and trawl have erratic movements: they jump, zigzag, move forward and backward

You have two GPS inputs. Coordinates can be slightly different between the two GPS so the position of the trawl changes according to one or the other.

Open the control panels and check if you receive coordinates from two GPS in NMEA Inputs. If so, remove one of the devices.

Positioning on SeapiX: Port/starboard trawl doors are reversed

NMEA output sentence may be wrong.

Go to Settings > NMEA Outputs.
Click the edit icon in front of the corresponding NMEA output.
Click Data to Emit tab, then check that Emit trawl positioning sentence is set to Best sentence for Seapix ($PTSAL).