I’ve been a volunteer diver for a number of years at Maritime Heritage Minnesota (MHM), a marine archeology firm here in the Twin Cities doing underwater survey work in the state, Over the past few years, we have been working at Lake Minnetonka to search for sunken wrecks and determine what they are and how they got on the bottom.
We’ve used Navdive (our GPS-based navigation system for divers) on many of our survey dives, including yesterday when we spotted a possible wreck on our surface-based side scan sonar in the dive boat.
With Navdive, we were able to:
- Preprogram GPS coordinates that were obtained using the side scan sonar on the boat, allowing the diver to navigate to each point while remaining underwater.
2. Capture GPS coordinates of underwater features that are discovered during the dive for cataloging later.
3. During the post dive analysis, we were able to show the path our divers swam during the entire dive.
The results? More efficient use of our underwater time, better data for our research, and the ability to integrate all of our data sources (i.e. surface-based side scan sonar, Navdive data, and Google Earth) to produce reports documenting our findings.
For more info on Navdive, see our web site here.