The 102cdoes not have dual frequency which means it runs the same beam spread, whatever the depth, which means in deep waters you could be picking up a rough area of a couple footy fields which doesn't help put you ontop the action. It also runs 300w RMS output where the 107 runs 500w output which states a depth reading of 775mt instead of 279mt. Now that sounds like an overkill but they rate the depth capabilities in absolute optiumum conditions (water calarity, salt and temp levels etc.) which means for a better idea of weak signal return, turn the meters to feet. So whatever the depth, the return quality pictured on the 480 x 480 pixel screen is not gonna leave much to be desired. Both good units, but the 107cdf is worth a couple extra $. If you want one, PM me, but stock times are ???.
The LMS 480 is not a bad unit, but stand alone units make life a lot easier. The casing and screen are the same one used in the 107cdf but it is only greyscale and the sounder strength is much the same as the 102. I've gone for the GPSMAP 172c as a plotter only, which can ??? be used as a 500w sounder also with the purchase of the GSD 20 black box although will not have 1/2 the functions of a stand alone sounder. Good luck
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Cheers, Jay
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. Hopefully soon but easier for me to accept as my boats two weeks behind schedual 
