Can GPS marks from a phone be...........

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I had that app when it was free then when they wanted money I stopped using it

the only finders I know about are Humminbird, if you know the
GPS coordinate Latitude & Longitude it is easy to do
if you can put them on a PC you can copy and past then put them on as SD card using humminbird PC put them in the fishfinder and Import them

some thing to look at
https://dbe2w38xsulyl.cloudfront.net/wys...ync_EN.pdf

google this
transfer navionics phone app waypoints to Lowrance elite 9
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