Originally Posted by tomeclipse
The only waypoints I ever have are the ones I used as starting, turning and destination
points on my routes. So all my waypoints are important. Miss one of those and I might be aground.
The same can be said for all waypoints that are used in a route. What one person considers "important" may be different from another person. My reference to "important" waypoints were marinas
, obstacles, bridges, anchorages
, and other important landmarks that I want to see listed in my waypoint database. I also have dozens of routes using hundreds of waypoints, but I consider them less "important" because they are just spots in the water
- not specific landmarks. If they were listed in my waypoint list, I'd have a huge number of waypoints named 001, 002, 003, etc. and the names would not be unique because every route has the same set of numbers. I definitely do not want those showing in the list.
Like you, I don't want to miss a turn along my route. But my likelihood of missing a turn is no greater because they're not in my waypoint list. And I know I can easily bring them up for inspection
by simply double-clicking on the route.
As with most things with OpenCPN there is an easy workaround. If you want all your route points to show up as permanent waypoints, then just create a series of permanent waypoints by right-clicking and selecting "Drop Mark." You can give each mark any name you want to. Then go to the route creation tool and click on each waypoint along the route. OpenCPN will give you the option of using that waypoint for your route. Then you'll have it set up just the way you want it.
FWIW, I have never heard of waypoints or routes getting transferred into a GPS and then being incorrect. I've heard of people who could not transfer them at all, but for those who were able to transfer them, I never heard of them being at a different lon/lat.
And do you really need to check the lon/lat of every single
point? I would think that just looking at the route on the chart would give you a good confirmation that each waypoint was in the right place. If it's in the wrong ocean or on land, you'll notice pretty quickly.
Note, also, that one of the more common sources of errors on chartplotters is the calibration, projection, or datum of the charts
. So you could check lon/lat of each waypoint and confirm that it's exactly correct, but then find that it puts you on land when you thought it would put you on water
. That's another reason why looking at the route graphically on the chartplotter may be better.
For example, here's a shoreline-hugging track of our stop-off at BVI customs
at Little Harbour Jost Van Dyke, displayed on NOAA's chart of the area. I'm happy to say that we did not hit ground despite what the chart showed. The captain
knew the area well, so didn't even use a chartplotter. I captured the track in my handheld to gain local knowledge, and I am glad I did:
Garmin's chart of the area had an equally bad error in the other direction:
Prior to my next visit, I De-Zoomified the NGA chart of the area and carefully calibrated it. It is much more reliable: