Fellas,

I'm after a bit of info on the performance of the TM260 operating at 50kHz to use the wider 19deg beam angle.

There's no doubting the performance of the 200kHz setting out deep, but with a 6deg beam angle it's only going to be covering a relatively small area in shallower water.

eg at 40m depth, the 200kHz is covering 4.2m width,  vs 13.5m wide @ 50kHz

So what I was hoping to achieve was running at 50kHz and holding bottom at decent cruise speed looking for new ground, then repass @ 200kHz and fine tune to the location & bottom detail.

The detail will be reduced at 50kHz, but as long as it holds bottom and can identify lumps.

Out deeper the 200kHz will do well covering a decent area due to the depth, so the main query is just relating to performance in the 30-60m range.

Obviously transom mount isn't ideal, so holding bottom will be reliant on a good installation.

It'd be good if M260 owners can chip in too, as the beam angles are the same.

(M260 installation may still be an option for me - just have to weigh up whether I want to cut the floor to access the bilge or not)

Taking it to the next level, how does the 50kHz go for detail vs 200kHz at slower speeds ?

aaaaand,

How does the 50kHz go for trolling etc ?   (assuming the narrow 200kHz is pretty much useless)

I've looked at the TM270W, but reckon the beam is TOO wide for general use.

Any good info appreciated,

Dizz.