On my lowrance x48 explain the sim sonar it shows depths that are crazy.also on the sims it looks like part of the fish are cut off and just blend in with the bottom. does this make since and what am i doing wrong?

SOURCE: Globalmap 2000 sonar not responding

Not enough info to diagnose your problem. It sounds like a networking problem. I couldn't find a manual for the sam-st module so I'm not sure how you have it hooked up. Typically with these devices only one would be hooked up to the SONAR module, and it would then share the data with the other display via an ethernet or NMEA2000 network. The erratic behavior of your bluewater could be due to some sort conflict with the current coming from the GlobalMap2000. Do you get the same problem when the 2000 is turned off? Have you tried running the GlobalMap2000 with the bluewater turned off?

SOURCE: proper set up for lowrance sonar

Where do you use your boat?

There are so many variables it's hard to fit it all here, but there are some excellent tutorials on the Lowrance website. The most important thing is to pick the right frequency, for the depth of the water. (200khz for less than 70', and 50 khz for greater depths). Depending on how serious you are about fishing, there are a lot of extras that you may never use. The key is to figure out which features will help you the most and forget about the rest.

You may also get some help at this link: FixYa Service Directory

It's common for SONAR to lose contact with the bottom at high speeds. The better the transducer installation, the faster you can go. Turbulence and bubbles will cause the SONAR to drop out. Lowrance's transducer installation guide explains it very clearly.

SOURCE: I NEED REPLACEMENT ROLLERS ON MY LOWRANCE X16

We have a x-16 that hasn't got 10 hour total on it. It was used on Sheriff Dept rescue boat and has been storage since late 80's. 25.00 and you pay shipping buys the unit and a case of paper for it. It doesn't have the power cord or transducer with it. That was misplaced years ago.

SOURCE: How do you get the fish to show up on the screen

Are you looking for the little fish symbols?
Press MENU, down arrow to SONAR FEATURES and press ENT. Arrow to FISH SYMBOLS and press ENT. Press EXIT twice. Any significant return in the water will now show up as a fish symbol.

Are you looking for the fish arches?
You won't get any arches unless the boat is moving and of course there are fish passing within the transducers signal. The shallower the water, the less area you are covering and less likely to get a fish return.

There is an OK guide to understanding what you see on the sonar screen at the link below. It if pretty technical but parts of it may help you out.

http://primus.lowrance.com/support/resultDisplay.do?gotoLink=5&docType=1000&contextId=351%3A5.47%2C11918.11930%2C22.47&clusterName=ClusterPublic&lang=english&docset=%2FDocuments%2FSonar&contentId=9de88fa2-0b60-4b44-a470-29ee14767b3e&responseId=135ccbe2cfd4f608%3A1fe88d%3A122773df7e0%3A7c2&groupId=4&answerGroup=1&score=981&page=http%3A%2F%2Fprimus.lowrance.com%2Ficr%2FSonar%2FChart+Tutorial.htm&result=0&excerpt=Chart+Tutorial+Deciphering+Sonar+Charts.&question=chart+tutorial&resultType=5000#Goto5

An X96 owners manual can be downloaded from http://www.lowrance.com/en/Downloads/Manuals/