Raymarine Tridata shallow depth reading

[Twhitt]

We have a Raymarine Tridata, and the depth won't read below 8m, not ideal when anchoring.

Any ideas what I can do?

Thanks

[Scorcher IV]

I would check what offset you have programmed into the display and if you have a lead line check how accurate it is you might have been a lot shallower than you think.. Sometimes the type of bottom it is reflecting off can have an effect also.