I am sort of new to all of this but I am antiquatedly familiar with the three gauges that used to prevail on virtually all sailboats...wind speed, speed, and depth. Three fairly important gauges. I realize that the modern GPS/Chartplotter has virtually done away with these but as an old fart I kinda want a redundant system and my poor Ericson 32 has spaces for these three gauges. I have been online for hours. Where do I go to get a more modern version of my past to backup my modern GPS?