"We try to get a questionnaire from the guy — where is he going to be cruising?" says Ron Muller of Electronics Unlimited, a dealer for Garmin, Furuno, Raymar ine, Standard Horizon and others in Fort Lauderdale (elec-unlimited.com). "We try to get a good baseline of how the boat is going to be used, the size and weight of the vessel to see if GMDSS regulatons apply, where it's going and what the plans are. Some of the specifications for the yacht can be dictated by the size or the weight of the vessel, where they may have certain equipment requirements." While those regulations are important, most boat owners won't need to be concerned, since a good installer will make sure the boat is up to code based on what he knows about its use.