Quote Originally Posted by WE16 View Post
I know nothing about the 498c. I do use a garmin GPSmap 76. If they use the same map format and all you need is the lake outline try here

GPSFileDepot - Garmin Compatible Custom Maps

They are topo maps. May be up to date?
I used the above maps in Canada and the lake and island outline was great
Thanks, I checked it out, the lake in question is newer construction and doesn't show up on the Garmin topo.