I have used CMAP cards and PC-Planner to plan trips to Maine and in
French Polynesia for the past 6 years. I have over 400 waypoints in
Maine, from the Five Islands and Robinhood area on the Sheepscot River
to Roque Island near the Canadian border. I have never found a
significant error in the location of one of my waypoints. The same is
true for the waypoints I created in advance for navigation in Raiatea,
Tahaa and Bora Bora for a trip last Sept.
David Sparks