Originally Posted by ncp
Make sure you get the GX2150 if you're going to connect it to a HDS-5/7. Garmin 740s (or above, I'm sure) can do the 2100. Great deals on that right now!!!
pretty sure you can't get the 2150 over here yet, (i tried) very minor differences on the 2100. See here -
Welcome to StandardHorizon.com
just under the first section there is a tag with the differences gx2100 versus gx2150 (about 4 things, baud rate adjustment for some chart plotters which only have one comport, pa/fog horn whilst using ais screen and different types of bearings to target)
Dimensions (W x H x D, mm) 180 x 80 x 160
Flush Mount Dimensions (W x H x D, mm) 161 x 65 x 150
simrad rd 68 dimensions (without flush kit, sorry i haven't got it still to measure that)
Dimensions (W*H*D): 185*88*168 mm
The standard horizon was the closest fit i could find and it's got a nice big display which was a bonus as well.