Solutions
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Todd Driscoll's post in Garmin Force with Livescope not smooth was marked as the answerYes, you can loosen the tension to see if this helps. The tension adjustment screw is located on the left side of the pedal. Also, apply a little WD-40 silicone spray on the friction points and brake disc. Access the brake disc through the underside of the pedal. Apply a little silicone to your finger and rub some on the disc. Just a little. Excess silicone may reduce the brake disc friction too much and result in the pedal being too loose.
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Todd Driscoll's post in Livescope Lvs 34 presets was marked as the answerGet into the LiveScope menu, then select the star box just below the hamburger button (three lines) just to the left of the menu at the top of the screen. The hamburger and star buttons toggle between the menu and the presets.
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Todd Driscoll's post in Garmin Sd Cards was marked as the answerYou need to get your user data into the universal GPX format, then it will be a straight import into Garmin. I am not familiar with Humminbird, but you can search the internet for various ways to make the conversion of your Humminbird file to GPX.
Relative to mapping advice, I need to know which specific Garmin units you have. The newest ones have Garmin Navionics mapping built in, so the exact units you have will dictate which mapping card would be most useful.