Just installed a couple of helix 10s last week. What are yalls opinions of Navionics or Lakemaster sd cards? I mainly fish East Texas Lakes. Thanks

I would take a look at which ones offers the best coverage of the lakes you most commonly fish. For Navionics latest mapping you can check out the Navonics Webapp at:
https://webapp.navionics.com/#boating@6&key=omvvDnjx%7DP
Be sure to toggle the button in the bottom left to turn on the Sonar Chart layer, to see the latest and greatest. I run Navionics in my Solix units and did in my Helix as well, with that being said they are both great tools with each having their own strengths and weaknesses on different bodies of water, which is why I recommend seeing which offers the best for the areas of the lakes you fish.

Each have their strengths, depending on the lake. Lakemaster offers some useful features for depth shading and water level adjustments that Navionics doesn't. My preference is to have both and then use the one that works for my location that day.

Thanks. I bought a Lakemaster Plus card to start. I may add a navionics card later.

Navionics