Catamaran Cruising

The 750 looks a nice bit of kit! I did some research and it seems that you will need to purchase a new sd card in order to update the internal  bluecharts. I found this link
http://www.activegps.co.uk/garmin-bluechart-g2-uk-ireland-map-update-card.htm 
Although that page is for a 2016 chart, I would hope that if you phone them they may have more recent updates as well... Hopefully that should help ? ..

Digressing,  I have a very old and loved garmin 176c that has ancient charts that I use as a backup. For me, the answer for affordable and up to date charts now is to use a phone or tablet and the Navionics charts. They are affordable and work well for me. Of course other charts are available, and I used c-map happily on my PC for a few years, along with the superb Neptune navigation route planning software.  But Navionics seem to have better prices, certainly for tablet/iPad use. If you look at our map page, you can see full Navionics charts for anywhere in the world. This should give you an idea of how they look.(PS the CCA does not have any connection with Navionics, we just use their charts on the map page) 
 I think the garmin charts I had used a different 'look' and so you may find it takes a bit to get used to them.

Sorry I went a bit off topic, but hope this helps..

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