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Scatcat.
I have a 2016 Puma FTD and I am wondering where any of you guys have your Point 1 antenna mounted on your boat. The only good place I can find to mount it is on the bow, but I have read several places that say it shouldnt be mounted up there due to interference from trolling motor. Any advice from any of you who have this on their boat would be appreciated.
We mount them left of the trolling motor on the flat panel. The Point 1 is a compass coil sensor and the bracket is aluminum and presents limited interference.
May make it hard to calibrate due to the magnets in the motor. If thats the case, just put the trolling motor over while calibrating.
Check out YouTube… Pete Wenners has a video about the point 1 mounting and use, makes a few good points. He has 2 on his boat… one for the console graphs and one for the now graphs. If your ducer is at the rear and your point 1 is at the bow all your waypoints will be 20ish feet off from the get go…. just something to keep in mind. If you mark one facing one direction and the next time you come back youre facing the opposite you could potentially be 40 feet off the mark.
Scatcat, that could be true, but it depends on how you mark the waypoint. If you mark it as you go over something, you could be 20 + the distance the boat traveled after seeing the “point” to the time you marked it. However, if you stop the screen and mark it on the screen using the crosshairs, or if you mark the side imaging over on the side, again it stops the scrolling and uses the crosshairs, then your marking in relationship to the worlds longitude/latitude and the position of the GPS antenna doesnt come into play. As you said, depending on the direction youre coming to it when approaching, it could be farther off. That is the reason many mark two points if marking offshore. One for the actual point being marked and one for the direction to approach from.John
Your latitude and longitude will always be where your GPS antenna is whether you are using a point one, lcg or the internal antenna on the unit. If you put your sonar transducer on a 50 mile long cable, drove the transducer to the lake and dropped it on top of your favorite brush pile and started marking waypoints its still gonna show your boat sitting in the garage on your map because thats where the GPS antenna is. And your waypoints will be in your garage 50 miles off. The only way that graph knows where in the world it is, is by triangulation between your GPS antenna and 3 or more satellites. Therefore the further your GPS antenna is from the sonar transducer, the further off your waypoints will be from correct. If your antenna is directly above the transducer it doesnt matter how you mark it, they will be accurate.
I respectively disagree. When you mark a “Rock” using the crosshairs on you side imaging, 30 from the boat to the right, it marks that rock at its (the rocks) latitude/longitude, no matter where the antenna is. If you are on the sonar screen and the sonar scrolls through, only the first line of pixels from the right are under the boat, but many times we dont mark at that point, however, the picture paints while its scrolling through and almost off the screen by the time we mark it. If you just mark it by pressing “flag” or “checkmark”, youre marking the location of the antenna at the point you press the button, however, if you stop the screen and use the “crosshairs” to put on top of the structure, and mark, you are marking the location of that structure, (longitude/latitude) which could be 50 to 60 behind the boat (away from the antenna), depending on your speed.In your example, if you go out to your garage, turn the unit on and scroll to the lake you fish, locate the ramp you use and drop a waypoint. That waypoint will be at your ramp and not in your garage — no matter where the gps antenna or the transducer is. This is because the antenna knows it location and because of the map accuracy, it knows where the “point” (longitude/latitude) is that youre dropping the waypoint.
Right… but the boat ramp is already part of your map. How does it know where that rock is?
the same way it knows where the ramp is. It doesnt look at pictures, it looks at coordinates. It doesnt know there is a ramp there. It is marking the coordinate. The ramp is at a coordinate, it shows at the bottom of the screen when you set the crosshairs on it. Same as the rock, it shows the coordinate when you set the crosshair on it.When youre idling around the lake and just mark a waypoint, its marking the coordinate at the antenna. However, if you use the crosshairs, you mark the structure at its coordinates.
When you see something on the side imaging and you scroll over to it with your cursor, the coordinates that is shows you are calculated based on your boats GPS coordinate. It figures your boat coordinates by your GPS antenna.
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