I have a FF250 and am in the market for a chartplotter. Have looked at the Garmin units. Why would I want to connect the two together? Can you please elaborate on this? I’m biased towards the Garmin simply because I already have 2 fishfinders and a handheld from them and have been pleased. However, I want to make the chartplotter decision based in part on which units offer the best mapping software and all the options confuse me. Seems to me all you can put on Garmins is the Garmin MapSource data that comes on a CD-ROM and you download it from your PC to the unit? Some folks have said the Garmin MapSource maps are poor and recommend the Navionics stuff instead, thus shifting a fellow towards Lowrance. Opinions on this topic please. Thanks.