Thread Tools Search this Thread Display Modes
Old 02-13-2019, 03:09 PM   #1
Veteran Member
Jgutten's Avatar
City: Bonita Springs
Country: United States
Join Date: Jul 2017
Posts: 30
Transducer Depth

My Mainship 400 was recently on the hard and I decided to take an accurate measurement of the depth of the transducer from the bottom of the rudder, which is the lowest point on my boat.

The previous owner told me that the transducer was 18" from the bottom of the rudder. The transducer is mounted on the port side bottom just under the Racor in the single engine version of the Mainship 400.

I had set the depth finder gauge at 18" relying upon the former owners information. So after measuring the transducer, it's not 18" from the bottom on the rudder. It's 29" from the rudder bottom. I've had the boat for one year and had an actual depth of the boat that was 11" deeper than the depth gauge was set for. Never went aground but I guess I was lucky.

If your boat is out of the water, good time to check the measurements to be sure your depth gauge is set properly.

Jeffrey F. Guttenberger
2005 Mainship 400
R Time
Jgutten is offline   Reply With Quote
Old 02-13-2019, 04:45 PM   #2
kchace's Avatar
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 1,258
Good point. Im planning on checking and adjusting mine. I've always assumed 2' but as you found, might not be correct. best to actually know.

Up here in the NE where the bottom is so variable, I always want several feet or more, but in some places, one can be within a few feet of the bottom for miles and that's normal.


kchace is offline   Reply With Quote
Old 02-13-2019, 06:28 PM   #3
Veteran Member
City: Grand Manan,N.B.
Country: Bay of Fundy-Canada
Vessel Name: Puffin II
Vessel Model: Mascot 28 PH Motorsailer
Join Date: Jun 2018
Posts: 39
Measure twice / Len

Click image for larger version

Name:	A little ding..jpg
Views:	32
Size:	130.8 KB
ID:	85301

Click image for larger version

Name:	A little ding.PNG
Views:	27
Size:	38.4 KB
ID:	85302
:) My personal experience &/or my personal opinion-feel free to ignore.
deblen is offline   Reply With Quote
Old 02-13-2019, 07:09 PM   #4
High Wire's Avatar
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,490
...and make sure you get the +/- sign right.
High Wire is offline   Reply With Quote
Old Yesterday, 04:12 PM   #5
TF Site Team
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 1,330
If an 11" variance is the difference between floating and grounding, the water is too skinny for me to traverse.
Shrew is offline   Reply With Quote
Old Yesterday, 04:46 PM   #6
Senior Member
bgillroy's Avatar
City: Marathon, FL & On Loop
Country: usa
Vessel Name: Maka Honu
Vessel Model: Ta Yang, 42 Tayana PH Trawler 1976
Join Date: Mar 2014
Posts: 115
During refit last year, to align both depth instru, recorded measure from xdcr faces to deepest keel depth (running gear in pocket between keel & hull-protected). After launch adjusted instru so displays show water depth under keel,alarms set at 2ft. Installed forward sonar (2 dimensional picture) that sees 6 X current depth ahead; we only use when in skinny water.

bgillroy is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 10:40 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012