Gene, like you I don't have a chart plotter. You mentioned replacing your instruments with ST60 if your Datamarine packs it in. Have a look at the ST40 as well. Smaller and about 1/2 the price but with similar functionality. Mine has been going for about 10 years. On a larger boat it might be nice to have the larger display but on a 27 footer the ST40 is plenty big enough.