Around Mount Desert Island most traps are singles with a single float. You will find toggles in deeper water and in areas with strong currents. In deeper water a lot of the buoys have two traps. I almost never see three traps on a line. In theory toggles are used to take the main weight of the line down to the trap in deep water. That makes it much easier for the fisher to gaff the main float, which has little or no load on it. The myth that the toggle is to keep the line off the bottom is just that. Trap warps are generally made up in ten fathom increments with the line length being considerably longer than the high tide depth. No fisher has the time or is willing to spend the money to tailor trap warps to the specific depth, particularly since traps are moved frequently during the season. Two ended trap lines (float on each end) are simply not seen around MDI. I have seen them offshore (20+ miles out), but there isn't much gear that far out in the summer.

My advice for passing lobster gear.

Single floats - These are pretty easy to spot because they tend to stand up vertically when waves pass. If they are vertical (mostly at or near high tide), the line will be pretty much straight down from the float. As long as you don't actually hit the float you will be fine. At low tide, single buoys will often be floating on their sides and will rotate toward vertical when waves hit them. When they are on their sides, the stick through the float points down current/wind. Pass on the stick side and you will be fine. The line is now sink line, so even if you pass on the up current/wind side of a float the line will be quite deep unless you pass right next to the float.

Toggles - Toggles consist of a smaller float (normally solid colored and not related to the color pattern on the main float. The line to the trap goes down to the trap from the toggle float. The main float (colored for identification) is tied to the main line from the toggle to the trap anywhere from 3 to 10 feet below the toggle buoy. The line from the main line to the colored float can be anywhere from 10 to 50 feet long. That line is sink line and will form a deep loop from the colored float to the toggle buoy unless the current/wind is strong. In general, the colored float will be down wind/current from the toggle buoy. Pass down wind/current of the main float and you will be fine. Alternatively pass the toggle buoy up wind/current by 20 feet or so and you will be OK. On an up wind/current pass you run the risk of being carried onto the buoy if you pass too close.

Traps tend to be set in strings (lines of traps). If you look around you can pick out the lines of same colored floats that mark strings. Life will be easier if you don't run straight down a string of traps. Traps are also clustered around local rocky high spots on the bottom. If you look at your charts and give the shoals a wide berth you can avoid the biggest concentrations of traps. For this purpose, a shoal is anything 10 feet or more shallower than the surrounding bottom. Navigation buoys tend to be close to shallow spots, so pass well on the deep water side of buoys.

Fog - Yes we have fog in Maine, but it normally isn't super dense. Although it may not seem like it, you normally have 1/8th to 1/4 mile visibility, which is plenty for a 7 knot boat like yours. With modern nav aids (chart plotter and radar), fog isn't a problem but it is stressful. I prefer to stay in port when it is foggy. The fog will disappear when there is a frontal passage.

Rough weather - We have rough conditions too, but they are the exception in the summer. Lobster gear can be very hard to spot in rough weather, so you are best advised to enjoy a day in a snug harbor rather than go out and get beat up. That said, even on rough weather days, there is always calm water in the lee of the islands. If you plan your routes with weather in mind, you can avoid 90% of the serious chop.

Tides and currents - Tides range from about 10' to 15' (full moon) on most of the coast. Set you anchor rode for high tide depths and don't cut buoys at low tide and the tide won't be a problem. Just remember that a wide open harbor at high tide may look a bit more intimidating at low tide. Currents aren't really a problem except in the rivers of the mid coast where tidal current combined with river flow can be greater than 4 knots. Most places tidal currents are two knots or less. For a slow boat, current is a factor when heading east of Mount Desert Island. If you head east on a falling tide, you will lose 1-2 knots of speed over ground and the 45 mile run from MDI to Roque Island will take 9 hours instead of 6.5. Similarly, on a flood tide the same run will take a bit over five hours.