Hi ET Ennis,
If you are looking for a standalone chart plotter, then I would say the best value at present is the "Garmin GPSMAP451" (4" screen) or Garmin GPSMAP551 chart plotters as both these models come complete with free pre-loaded Ireland and UK marine maps and this is a big saving. However the prices do start at €420.00 for the model with the 4" screen.
I would recommend if you can afford it to go for the 551 model with the 5" screen as you get alot more value for money. All of these models come with a built-in GPS antenna, so with just the addition of 12volts it works straight out of the box.
Chartplotters are great for storing your way points and also getting you home safely or just back tracking a spot you just drifted over as all your movements are stored and shown on the map until you clear them.
Depending on how old your current fishfinder is, it may also be worth considering the "s" models of the above as these include a built in fishfinder, so if you wanted to tidy things up around the boat, this may also be an option, but of course more money and you also have to invest in a transducer.
Have a look at Marine Web Store Ireland page, as they have the full range with the prices broken down for each model, the link to their chart plotter page is:
http://www.marinewebstoreireland.com/#/ ... 4533773200Good luck with this and I definitely think even from a safety prospective, its money well spent.