I have been using a Garmin 198c for the last 10 years on my 1995 Grady white 22 seafarer. I'm going to upgrade and not sure what unit to get as of now although I do need to go with a bigger screen, not sure 7 or 9 inch? the problem I foresee is where do I mount this unit ? Id like to flush mount it on my dash but then I lose my locker/glove box. Any Ideas or pictures of modifications would be great thanks