How old is your Chirp 7? Lowrance has a program that let's you upgrade your old fish finder within 5 years of purchase. My Hook2 9 TS went bad at 2 years 4 months (just out of warranty) so I had the option of $200 to fix mine or upgrade to an Elite 9 TI2 TS ($899) for $495. Got them down to $395 by asking them why I should stick with them vs one of the other brands.
I decided to upgrade but something went wrong with the order (a wrong number was put in for the new model).
I got a shipment but it was a SD card C-Map Insight Pro.
I called them 3 times (3 hours of hold each time) before they figured out the problem. Since they hadn't shipped the new unit yet I made an inquiry as to how much it would cost to upgrade to the Elite 12 TS ($1699) instead?
Since I had some much trouble with the whole thing and the fact that I stayed calm and polite, they sent me the Elite 12 TS for the $395 price (sent it over night Fedex too)