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>>>I'm taking it you have a dedicated GPS
Yes. Had the small 2.2" screen Etrex with full UK marine maps for near on 15yrs. Then as I found the small screen harder to read unless close to me I upgraded and now have the 5" screen Montana 700. It's still a stand alone as far as power supply goes but I have it on a seat mount where I can easily see from the tiller position. I still carry the Etrex though as a backup as it fits in a lifejacket pocket, also discrete to carry if offered a trip out with someone who might be a little more uncertain in their Nav situation.
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