Not sure I can help you much, but need to inform you of an experience I’ve recently had with my Helix 5. I love the unit and plan to use it for the first time ice fishing this year and hope everything works out well, but the last two times out I’ve had a problem with the screen fogging to the point of being unusable for the first hour of operation. Email to support said it’s normal with the weather conditions this time of year.
Quote” Hello Sir,
Condensation – Although your Humminbird unit is waterproof, the air within the unit contains moisture due to natural humidity. Due to this, some fogging is normal on cooler days. The Spring and the Fall are the most typical times of year that we hear about this. This situation is caused by heat generated from the sun warming the air in the depth sounder. The moist air is then trapped between the display and the lense in the front housing. This situation can be avoided or reduced by storing in a protected and safe area at outside temperatures. The situation should clear after about one hour of use. If not, the unit can be sent in for service. However please understand that we cannot stop a unit from having condensation under the above conditions.
If you have a glass bonded color display (in our 800 Series and higher products) condensation cannot form as there is no void between the display and the lens.”
If it were me looking again for a unit for both open water and ice I would consider the Helix 7 as one of it’s advertising bullets is a Glass bonded display.
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