Since I was using a Garmin 76S before getting a Lowrance 522C I continue using both units having the same way points on each. I keep the Garmin zoomed in maximum and use the Lowrance as I close in on the way point then use the Garmin while working the way point.
I can carry the Garmin and mark way points when fishing with others and once I'm back in my boat I use the Garmin to find the way point then mark my Lowrance.
If I would ever have to do a reset on the Lowrance I would loose my way points on the Lowrance but would still have them on the Garmin to get them re-entered into the Lowrance. I also have Easy GPS a free software program on my computer where I can bring the Garmin in and up load and save the way points on my computer where I would be able to down load them onto another GPS.
“There is no difference between communism and socialism, except in the means of achieving the same ultimate end: communism proposes to enslave men by force, socialism—by vote. It is merely the difference between murder and suicide.” Ayn Rand