SAMM
User Manual
55
If the problem persists, you
may try to disable your firewall or set a firewall
exception for the SAMM software.
3. If you are not receiving position/heading data:
If using a serial port, please make sure your GPS/compass is outputting NMEA
Lon/Lat message and NMEA HDT messages for heading. Make sure that serial
communication settings in SAMM (baud rate, parity, stop bit) match your device(s).
If you are using GreenSea navigation data, make sure to select the GreenSea
navigation from the Position and heading dropdown menu. This disables the serial
port input.
4. If the PPI does not look correct, try viewing the sonar properties by clicking the
Properties
icon on the main toolbar and identifying the problem from the attributes.
Gemini Sonar Controls
The Gemini sonar controls include range and gain slider bars, a checkbox for fixing the sound
velocity, and a checkbox for disabling the auto ping mode (Figure 46).
Figure 46. Gemini Sonar Controls
The range slider enables the user to specify the maximum range the sonar will scan (or ping
period). Longer ranges mean longer ping periods, since the ping must travel further. The gain
slider enables the user to control the relative sonar receive gain. Gemini users may experiment
with this setting according to their preference and water and target conditions; OIC has found
the 60-75% range a useful starting point in our test marina. Setting the gain too high introduces
artifacts into the sonar data (Figure 47).
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