Flightlead
Contributor
JKSing
In answer to your question on mapping, we have a defined protocol which I feel sure will work well for mapping. Ed, Mark, and I did a dry run a few weeks ago when we found the sunken wooden boat. It involves marking from depth and surface recovery of the markers. I don't think recovery of markers from depth is feasible using milk jugs. The best option is to shoot range and bearing to each marker from the end of the point of land. I confirmed it is easy to shoot the bearing, have not tested range. BTW I had no idea how far out we were actually diving. The boat is about 3/4 of the way out to the island at least, perhaps further.
you might remember a discussion about the mapping I started a while back. everyone was really interested until it came time to actually commit to doing it. My feeling is that with 3 teams of 2 divers each, each team doing 3 dives and taking turns as surface support we can do a very good job of initial data collection in one long day IF we start with a reasonably decent initial sketch (ie we only have to record corrections for the most part, not exploration). There are a couple of folks at least on here who with combined knowledge can provide that initial sketch.
In answer to your question on mapping, we have a defined protocol which I feel sure will work well for mapping. Ed, Mark, and I did a dry run a few weeks ago when we found the sunken wooden boat. It involves marking from depth and surface recovery of the markers. I don't think recovery of markers from depth is feasible using milk jugs. The best option is to shoot range and bearing to each marker from the end of the point of land. I confirmed it is easy to shoot the bearing, have not tested range. BTW I had no idea how far out we were actually diving. The boat is about 3/4 of the way out to the island at least, perhaps further.
you might remember a discussion about the mapping I started a while back. everyone was really interested until it came time to actually commit to doing it. My feeling is that with 3 teams of 2 divers each, each team doing 3 dives and taking turns as surface support we can do a very good job of initial data collection in one long day IF we start with a reasonably decent initial sketch (ie we only have to record corrections for the most part, not exploration). There are a couple of folks at least on here who with combined knowledge can provide that initial sketch.