Are the 2d readings coming from the same xducer ..??
Any anomolies in the 2d images ...??
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Make sure the xducer is still parallel with the water's surface ...
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Open the SI XPress menu (1 Menu button press)...
*Make sure the "SI Range" setting is set to more than the actual water depth ...
*Raise SI Sensitivity to increase brightness ...
If this doesn't work ... Restore Defaults under the Setup tab ... And then post some snapshots of the issue ...
Rickie