Hello all, I have a Helix 9 from humminbird.  It’s a great unit and I love it, but I need to upgrade my maps.  I live out west and the lake that I most want is Lake Powell.  It doesn’t look like  Powell has any Hi-Rez mapping from anywhere. It’s a huge lake 250 miles long with one of the biggest shorelines of any lake in the US.  
 

I’ve tried to decide if I should buy a lake master map pack from humminbird, or if I should buy a navionics+ map pack from navionics.  But to be completely honest, I have no idea what the hell I’m doing. I’m not even sure if both of those Map packs are compatible with my unit.
 

Lake Powell is the first lake on the Colorado river drainage system, it’s situated above Lake Mead. As such the surface water level in Lake Powell can vary by 50 feet or more from one year to the next,  so I need a map that I can do water level offset to try and get it dialed in.

 

I am an absolute newbie at this and really don’t even know how the hell to get this to work at all, I tried to hold today on with hummingbird for about an hour and couldn’t get any help.

 

I’m hoping somebody somebody on here can give me some advice on what to buy and how to do this.

 

thanks

I would recommend lakemaster if you have a humminbird unit. Humminbird owns lakemaster so they are quite compatible with each other.

 

As for manually adjusting the map to the changing depths of Lake Powell, I can’t help you there.

 

There are usually software updates every so often. Maybe they address the changing depths on Powell with those.

What gimruis said. A helix can do depth offset easily. 

Agree with previous - use what's designed for your unit. LakeMaster for Humminbird. There should be a setting on your unit for +- depth adjustment...I know my Garmins have it.

 

Unfortunately, I don't think LakeMaster has an online 'preview' like Navionics does.

 

Navionics for Lake Powell

Overview

 

Dungeon Canyon closer look (red rectangle above)

I really appreciate the responses!  My only remaining question is this — is the lake master map as high of resolution as the avionics map?  

3 hours ago, Darkphage said:

is the lake master map as high of resolution as the avionics map?  

That second one isn't even close to what Navionics can do....here's an even closer look of the southern tip of Dungeon Canyon. I've never seen a LakeMaster map, so can't tell you the difference.

Here’s the Lake Master map of the same area @MN Fisher posted I think. This is a screenshot from the iPad app.  The colors are customizable and are using my settings.   It is not a high definition LakeMaster map.  The lines and text are blurry because I had to reduce the size of the image to post it here.