Please welcome Eyoyo Underwater Fishing Cameras.https://amzn.to/3siEgXn
I have the lakemaster maps in my Helix 10's on my boat and definitely worth it. 1' contours on the larger lakes in my area make it easy to set up on a spot you want. I want to get the Helix 5 or 7 for ice fishing just for the mapping.
It came pre loaded on my garmin 7Its pretty nice but I am use to my navionics.If you have paid navionics I wouldnt bother buying lakemaster