The NN3D does not merge points when files are imported. This was the same with NavNet 1 and NavNet Vx2. Besides software packages like MaxSea, that do allow merging, dealing with the NN3D CSV files are not as difficult as one might think. You can backup many files on one SD card. You could back up the existing points before importing the new ones. When done, you can bring back your original points. Ideally, you would keep a master set of points, and save them. Let’s say you wish to have your Fishing points and Nav points separate. Just back up your Master (everything) set, then delete the Fishing points and save a backup of the remaining points as “NAV POINTS”. Then restore you master backup, delete the Nav points and save a file called “FISHING POINTS”. Now you have three files…Everything, Nav & Fishing. You can also use the grouping functions for points to display and sort your points separately.
Now you might say… “But Johnny that isn’t merging. I have taken my buddy’s fishing points from his NN3D and I want to merge them with mine.” AGREED! You might not have MaxSea TZ or other package to merge points, but most people do have Microsoft Excel. CSV files can be opened and edited in Excel. You can cut and paste the fields or edit them manually then take the file back to the NN3D.
(To everyone) We are here to try to assist and it would be nice if the tone on the forum remain friendly. I understand you might not like an answer we provide but we have useful information to offer. Most people appreciate it. There are plenty of places to vent on the web, but I would prefer to keep this a productive place where people can get answers.