Great question -
A lot of the features you want are available on a lot of GPS units, but first let me say, I am biased. I have used Lowrance, Magellan and Garmin, and I prefer any Garmin product over 80% of GPS units out there. Depending on what you want to spend, you could go from around 150 dollars all the way up.
The one tricky part is depth.
Based on what you are saying, I would recommend the Garmin 60cs or 60csx.
They both have digital compasses, they will offer trip computers to tell speed, and they will give you a top down view, though not necessarily all at the same time.
To get depth information, you would have to get the Blue Chart software which utilizes depth soundings on the map display, but I think that would give you a good idea of how deep you are.
The added benefit of the 60csx is a built in barometer which you could use to do some rudimentary weather forecasting too.
Take a look at that, if the cost is steep, the 60 series do have some variability and you can definitely add or subtract what you want.
-Erik
You might want to consider the Garmin 76S, too.
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Both the 76S and 60CSX have built in barometers and both are water resistant.
With regards to water depth. I don’t know of a handheld GPS unit that has a depth finder. The console units have depth finders, but you have to install a transducer on your kayak.
Unless you are kayaking along the coast or in the Great Lakes, the Blue Chart software won’t do you any good. The software is great, but it’s coverage area is limited to navagible waters. Rule of thumb - if you can’t get a NOAA chart for where you want to fish/kayak, then the Blue Chart won’t have the coverage either.
If you are going to invest in a GPS, I recommend you invest a little money and get a good quality unit. Garmin makes excellent products. Garmin units support the GPX format which allows you to post and share data via the internet.
I have an older unit (M56) with shoot thru thull transducer. I have used it in the everglades and keys in fla. to the lakes and rivers of NY. Great unit with all the toys for a fidget A$$.
It will run off bateries and I keep a spare sleeve steup when on the water. Battery life is very good.
Wouldn’t be on the water without it. I have the Hobie quest fisherman.
Note that Garmin Bluechart is for ocean/bluewater. It doesn’t have lakes except those larger ones like the great lakes or lake champlain. There is another product that has smaller lakes, but I can’t remember its name.
You can get all but water depth in the most basic handheld general purpose unit. I have several Garmin Etrex and can recomend them. If you want a sonar integrated, it’s going to cost more/ get more complex. I personally preffer to keep these units seperated.
I’m picking up an eTrex Venture Cx for canoe tripping, I had to weigh it against the GPSMAP 76Cx because model one floats. Definately a plus for being on the water (but it is a bit more $$$).