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Dedicated to Preserving our Shipwrecks and Maritime History
"From Prevention to Preservation"
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GLSPS Annual Fundraiser!!

UMSAT Show Website

If we are allowed to have a physical Show
The Date and Venue for 2021 UMSAT Show!!

April 9 - 10, 2021

Friday Night at the Movies
7:00 to 10:00 PM

Saturday, 9:00 AM to 6:00 PM
Main Show

(Meet and Greet Party with Food and Beverages)
At The Holiday Inn Hospitality Room
(Next Door to Jimmy's)
7:00 PM to 11:00 PM


If we have a Virtual Show Only
The dates would be

April 6 - 10, 2021

There will be one speaker each night 
starting at 7:00 PM

Saturday will have two speakers and
the GLSPS Awards Event 
Stay tuned for the Lineup of Speakers for 2021

For more information on the upcoming 2021 UMSAT Show, please visit

If you are interested in joining the UMSAT Show Planning Committee, please email us at

Or, contact Mary Lillimo at "Show Chairperson", or Phil Kerber, "President", at

Here are the Links to Important Exhibitors Documents
  UMSAT Booth Table Layout at Jimmy's Event Center

We are always looking for speakers that would like to present a great topic about their scuba diving or adventure travel experiences.

Please let us know if you, or anyone you know, would like to be a star and speak at a future UMSAT Show!

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Check out the most beautiful magazine ever produced in Northern Minnesota!

GLSPS Project Sponsors

Air Down There Scuba offers free air fills and special pricing on rental equipment while participating in GLSPS projects. Required to show GLSPS Membership Card! 
Thank you, Scott and Tracy!

Aquaventure Dive and Photo Center offers free air fills and special pricing on rental equipment while participating in GLSPS projects. You will be required to show your GLSPS Membership Card.  They have also loaned us a GoPro HD video camera for a few projects. Thank you, Steve and Jolene!

Videos produced by Steve at Aquaventure Dive and Photo Center filmed in Lake Michigan on a Milwaukee charter trip. Click on their above logo for information to join them on a charter to visit these shipwrecks.
Prins Willem
The Dredge 906

HomePretoria Monitoring & Survey Project 2019


2019 Pretoria Monitoring & Survey Project

August 1 - 5, 2019



The Crew of the 2019 Pretoria Monitoring & Survey Project
(L to R: Phil Kerber, Jack Decker, Jim Chistenson, Mike Mack, Tim Pranke)

The Pretoria Donkey Boiler is Still Secure
Used as our mooring line for the Project 


Click here for more photos of the Project

Closing Report:
August 1 - 5, 2019

Our plans this year were to search for any other pieces of the wreck that weren’t discovered, using our new sonar.  Then, dive to monitor how the boiler securement chains and mounts were holding up and to begin documenting the undocumented section of port side hull next to the boiler.  We wanted to do the sonar work at the beginning of the Project to allow time to dive on any prospective sonar ”hits.”  We knew from our work here in previous years that approximately 100 feet of port side hull is still unaccounted for.


The 2019 Pretoria Project crew included Co-Leader Tim Pranke, Phil Kerber, Jim Christenson, Mike Mack, and Jack Decker.  The proper permits for diving on this historic wreck had been procured through the Wisconsin Historical Society (WHS) back in March.  Tim filed the Float Plan with Silver Bay Marina just prior to departure.


We left Silver Bay Marina, the morning of August 1, on an Easterly heading to Outer Island, a six-hour trip.  The Pretoria lies about a mile and a half north of Outer Island and just outside of the Apostle Islands National Lake shore boundary (hence the permit from the WHS.)  Discussion among the crew was on the possibility of finding missing sections of the wreck and parts of the wreck.  Last year’s discovery of the power steering mechanism was quite a thrill.


As we arrived at the wreck site, the waves were a bit too high for effective sonar work.  So, we dove on the boiler and the small undocumented hull section next to it.  The boiler was still attached to the bottom.  The chains were as tight as when we put them on, 2 summers ago.


As we headed to our dock for the night, Tim flipped on the sonar just to see what could be seen.  About 1000 ft. from the main wreck, some straight lines appeared on the sonar screen, indicating a large section of possible wreckage!  Our plans for the next day changed immediately!  


Tim was the first one down to see this section of the wreck in the 114 years since it went down.  As we each took our turns diving on this section, we were all amazed at the size of this section.  As a bonus, the rudder was laying on top of this section.


We spent the next several dives measuring and preliminary documenting this lost section.  The overall length of this section is 102 feet.  The rudder measured out at just over 32 feet long; standing it upright, it would be about as tall as a three story building!  Tim has been learning photogrammetry and has some great images of this section.


We spent time on the boiler and section by the boiler, documenting that section and measuring back to known points on the already documented main wreck. This is to triangulate the location of the section by the boiler to the main wreck. 


The final day, Monday, August 5, we left Outer Island and the Pretoria for home.  We decided to swing by and dive the wreck of the Sevona.  An interesting dive since the Sevona went down in the same storm as the Pretoria and had last docked at the same last dock as the Pretoria.  On the way to the Sevona, a passing thunderstorm caused us to pull into a cove on the south side of Bear Island to wait for the storm to pass.  We saw some spectacular lightning strikes and heard some close-by thunder.  After the storm passed, we continued to the Sevona.  The current was flowing, and we got one dive in.


In all, we performed 35 dives for a total of over 34 hours of dive time on the Pretoria.  The weather was terrific, so we were able to stay every night at Outer Island Lighthouse.  The boiler remains secured.  The steering mechanism is still impressive.  More pieces of the puzzle have been found and wait for complete documentation.  Though we have yet to see the resident bear(s) on Outer Island, the week after we left, the island was closed to campers due to bear activity.



For more information please contact us at


Jack Decker

Pretoria Project Leader




Tim Pranke

Pretoria Project Co - Leader




Phil Kerber


Captain - RV Preservation Research Vessel