To me it's not a choice between markers or GPS
. Use both.
The markers should be primary. Then glance at the GPS
on the GPS may be "new", but when was the survey
done? How accurate was the positioning back then? The GPS is totally accurate, but the charts
often aren't. Even on the ICW
I have had the GPS showing me over land when I was dead in the channel.
But when the markers get confusing, the GPS can help you orient yourself. I use both markers and GPS and the amount of information I use from both is about equal.
When you are at a place you will be going again, save waypoints at the critical points. Sometimes you are too busy piloting, but you can go back and do it later this way: Keep paper charts handy. Put marks on the paper charts when you are at a point where you think a waypoint will come in handy. After the trip, download the tracks from the GPS to your computer. Look at the chart you marked up, find the same place on your computer track and make a waypoint somewhere on the track. That waypoint will be accurate. But a waypoint made on the basis of the chart alone is questionable at best.