If your Humminbird GPS Combo is not displaying the LakeMaster map card try the following: 

In your Humminbird unit, check the "Chart Select" tab options to verify that the map card is being read (See image 1 below).  Choose Auto, or Left/Right card slot depending on your unit.

Check to ensure you have a compatible  Humminbird GPS combo product.  

Check to ensure that your Humminbird GPS has the most recent update available  in our FAQ Section.

You must  register  your GPS to see what updates are available for your Model.

Occasionally setting your Humminbird to North Up under the Nav tab>Chart Orientation Menu option may increase the speed of your unit. LakeMaster map cards will also display in "Course Up" mode. (See image 2 below)

After checking and adjusting the above settings, you should be able to zoom into a LakeMaster lake and see contours.

Image 1
Chart_ChartSelect  

Image 2
  CO_NorthUp

Ensure that your map card is a Humminbird LakeMaster Card.  Humminbird products do not support older Lowrance or Garmin LakeMaster cards.  

If you are still having problems displaying contours, please  contact us