I fish a small 300 acre lake that isn't supported by any of the map cards that I'm aware of.  I am wanting to use the auto chart feature on my helix units (12 g4n at console and 9 g4n at the bow) to map the lake. I have been reading up on the auto chart and PC software and now I'm more confused.

 

Can I just buy the zero lines card and map the entire lake with my Helix 12 G4N or do I need to buy the PC software to create the maps on the card to be able to view it on the Helix unit? I don't need any of the overlay, sharing or other custom features. I just want to be able to map the entire 300 acre lake and view it on my units.

 

Humminbird states that my units can hold 8 hours of data. How does that compute to lake size?

8 hours is about half of a 240 acre lake. Ask me how I know and why I have a zero lines card now. 
 

add the zero lines card and start charting. I don’t use the pc software since I don’t have a pc.  I chart on the unit and view on the unit. 

Thanks for that info.