I bought a couple of pair of shades off eBay for about $10 each. They have 250 cheaters near the bottom of the lenses. If they break or get lost I may say the S word but not the F one.
Darrel, A warm to GLF. Holler if ya need anything. There is a great and helpful crew here.
I have an old Starcraft Islander HT. here is a pic of her on the pond.
Nick, Good plan to keep the old one for charts. I never did like split screens. Maybe it's my old eyes. Even in the past when running my old Lowrance LMS 350 I'd toggle back and forth between the sonar and gps rather than run a split screen.