Originally Posted by Paul L
The Google Earth images
are decent enough to verify that your chart datum is correct and to see the edges of the passes in the Tuamotus. It isn't going to help you navigate through the majority of the atoll that is uncharted and filled with coral
heads. These need eye-ball navigation
to safely move through. The atolls are large, like 15 x 25 miles, of which only small portions of the passes and the area up to the initial town is usually charted.
I disagree with you Paul. We find that the satellite
imagery is startlingly good in the uncharted areas of most atolls for reef identification until you get into the most shallow areas within the anchorage. Even then, we use satellite
imagery to identify large patches of sand where we might choose to anchor
Of course, you should always use your eyeballs (for many reasons, including a blip in your GPS
signal), but we find that most of the time we *could* have used the satellite imagery (we use SASPlanet) for our sole navigation. In a desperate situation in an anchorage if we *had* to move to the otherside of the atoll for safety
, we would consider using our cached imagery.
Here is an example of how we've used SASPlanet split screened with OpenCPN in the Gambiers.
Electronic charting on Estrellita: SAS Planet & OpenCPN | Estrellita 5.10b
were almost always the most accurate in each country we have visited through New Caledonia
-- when compared with not-new Garmin and not-new CMAP charts.