I also have a SH plotter a cp300i, it works great & SH customer
service has been very helpful when needed for my
radar installation. The tech may of had a bad day or was just a a$$hole. I've found that SH has one of the best warranties in
marine electronics, 3 years & flat rate
repair cost for the original buyer. I wouldn't write them off because of a bad experience with one tech, I plan on
buying a larger unit & move the cp300i to the lower
helm, I wouldn't do that if SH products or
service had been problematic. Good Luck