If you want a more accurate track for your boat’s journey then this article tells you all you need to know.
How is a journey built?
Your journey on noforeignland is like a game of join-the-dots. Every time you submit a position report, the following information is recorded:
- Your position (latitude and longitude).
- The time you were at this position.
- And optionally, the path you took to reach this position.
Simple tracking systems, like Iridium GO! or adding a manual boat position update, only submit your position and time. The resulting track that gets drawn on the map is therefore just a series of straight lines that connect the locations reported, starting with the earliest time and ending with the latest.
More complex tracking, like the noforeignland app for example, submits your position, the time at which you were there, and also the path leading you there. This means that the lines joining the dots are no longer straight, but are drawn with great accuracy.
Advantages of using a tracking system that submits a path are:
- A much more accurate record of your journey.
- Accurate mileage calculations.
- You can add stories at precise locations along your track.
- Much less likely to ever see your track cross over land.
Your boat may sometimes appear to cross land when you are using a tracking system which does not include path data. This can occasionally happen with systems that submit path data too when there are GPS or timing errors in a recording.
In either case, the good news is that you can manually edit the path to a fix on our web site. For technical reasons it is not possible to provide this functionality in our app.
Top tip: Editing a path can be fiddly so we always encourage people to use a laptop rather than a phone or tablet.
How can I edit a path to a position fix?
Let’s look at the steps required to edit this boat’s journey where it cuts across an island:
1. Sign in to our web site
Before you start, make sure you are signed in to your account on our web site. If you normally use our app, then be sure you access the same user account by signing in using the same method (i.e.. Google, Facebook or Email/Password).
2. Show your boat’s journey and locate the fix you want to edit
In the picture above, the straight line that crosses land leads to the last fix in our boat’s journey, which runs from west to east across the map. We can see there is no path data as the fix dots have been connected using a straight line.
Zoom in on the map so make sure the fix dots are visible, tap on the fix at the end of the line and choose the Edit path option:
3. Edit the path’s shape
After selecting Edit path, red handles will appear along the line leading to the fix. Drag these handles to reshape your path. As you reshape the line, more drag handles will appear, allowing you to create a very accurate shape. When you are happy with it, press the SAVE button to save your changes.
4. Admire your new track!
Now, when anyone views your boat journey they will see the corrected path:
Can I delete a position fix?
If you need to delete a fix, then follow step 2 above and selecte the Delete fix option from the popup menu instead of Edit path. The fix, and the path leading to it will be permanently deleted.
Tracking systems that submit path information are more accurate than those that do not, but both can make mistakes; this is especially noticeable in areas where your track is required to weave around obstructions like islands or around bends in rivers.
In cases where your track does not look good, the noforeignland web site provides a simple mechanism that allows you to manually reshape it.