Charlie's right on with the strong currents in the area. Two and three
knot drifts are not uncommon, and coupled with
wind the effect can be magnified. As to the deviation between GPS position and chart, I can't really comment except to say that you have to be pretty damn good to mark your position on a larger scale chart with enough accuracy to critique the chart's identification of the mark's position. I'm using some older Magellans (which I will throw
overboard and replace with anything other than Mag or
Garmin when the units fail), and they are not WAAS enabled, so I err on the wide side when I try a
passage at night. I just this week purchased a Sitex Navmate 5.7 from Jason (a good guy--fellow blowboater) at
C-Map, and also bought the Max
C-Map charts for the area. It's my understanding that the new charts--brought out in Feb--have overlaid the existing charts with
satellite imagery and that the accuracy of the charts are much improved. Will share what I find out, as I still use paper and am interested to compare the plotter with the paper charts.
Just to second what Charlie, Lightfin & Randy observed, this event was an anomaly, which is what makes it remarkable. The vast majority of cruising is uneventful, but we are a community and as such have common concerns as to
safety and maximizing a wonderful experience.
Events like this one, unfortunate as they are, at least serve to make one think about what he would do if faced with a similar disaster. That makes them worth revisiting, though the worry they cause our loved ones when read is a problem. (Linda has informed me that she officially will not be sleeping well until she knows that I am clear of the area--I'm leaving on roughly the same course in about two weeks.)
A sidenote as to charts when inshore in SP waters--they do NOT show
coral heads, so the only time to
cruise "inside" is the middle of the day when the sun is high and you can birddog the
coral. Trying to navigate inside the outer reef by chart is lunacy and asking for trouble. Most of the
charter companies in the area require the
boats take a
mooring by 4:00 (so they're up for grabs after 4:00!)