I run a LMS-522 on the ice and I really like it.
It is very usefull along with the lakemaster chip.
Use the 5 inch GPS screen to get to yout hotspot and then switch to split screen zoom graph mode for fishing.
Adjust your settings to minimize the interference and you are good to go.
The back light has three settings on brightness, set it on the second brightest setting and you will have enough power for eight hours run time on a single charge with the GPS running the whole time.
If you have a local Mills Fleet Farm near you, they carry the PP-16 conversion kits for $160.
I have sold my FL-8, and FL-18.
All I use now is my LMS-522 and I have a X-102C for backup!