Originally Posted by tim griffin
... interested in the Garmins Malthouse send dimensions as has to replace a CP180 so need one of similar size so it fits on the console .
The CP-180 will leave a footprint of 180mm x 110mm which is landscape, whereas the Garmins are all portrait (ie taller than they are wide).
The 550S may be the closest match at 150mm x 160mm - I guess it really depends how many holes you drilled.
Any of this range will take an external antenna, but all have an internal built in.
PS The 450S is 145 x 130
PPS The 555S does not have a 7" screen, sorry about the error