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If you don't use a proper sun filter, you risk damaging your camera and/or blinding yourself. Get a proper filter if you want to photograph the sun (including during a partial eclipse). A proper filter only lets 1/100000 of the visible light through (called an ND5 filter) and also blocks IR...

I watched the eclipse from Marion, IL. Met with an organized bunch of eclipse junkies in Columbia, MO, and due to a poor weather forecast made a mad dash SE starting at 4:30am and ending up in Marion. Had scattered clouds, but had a nice opening for totality. It was a grand show! Went well...

Bear activity can also close trails. Your best resource may be to ask a ranger (particularly at the backcountry office). Others here may also have suggestions. I haven't been there since I was in grade school, so I am reaching back quite a ways: * Crypt Lake (of course...) * Grinnell...

I still think it is worth doing... :) The approach to Angel's Landing is a knife edge (with a railing). The "interesting" section of the trail to Crypt Lake traverses a steep slope--it is incut and had a cable for handholds. IMO, Crypt Lake trail is less scary--even my exposure-adverse...

The best thing to do depends on the species and the nature of the encounter/attack. Read "Bear Attacks: Their Causes and Avoidance" by Stephen Herrero...

This evening's TV weather forecast suggested that the aurora would be visible from southern NH to Canada. (Just his guess--no one can predict auroras with high accuracy.) He suggested that the Whites area would be a good viewing place and around midnight might be a good time. As already...

Just a thought: Your chance of clear skies is better you are out in the flatter lands to the east (downwind) of the big hills. It may also be worth checking the weather forecast and driving to a clearer area if your area is likely to be socked in. Doug

Re Roger's Rock: I believe the trail from the campground is open to the public (although there may be a day-use fee for parking at the campground). I have one map that shows it*--it is not shown on USGS topos. It doesn't appear to be well publicized... * Map: The Adirondacks, Lake George...

There is a trail from the campground immediately to the South. According to my 1989 edition of the guide to the Adirondack Trails: Eastern Region, it leaves from campsite 184. (I suggest that you check a more recent version.) IIRC, he trail has steep spots...

Cartographers and surveyors are very aware of accuracy issues. For instance, there are published accuracy specs for USGS topos. And a surveyor should be able to tell you the accuracy of any point that he has located. My point is that one should be aware of the errors whatever they are. IMO...

I don't think the concept of monotone can be extended to the 2D case (altitude is 1D, position is 2D), however a straight line is a special case which allows a number of simplifications. I'll leave out the issue of how one determines that something in the real world is indeed straight or how...

We should note that barometric altimeters also have errors and various forms of smoothing can be used in the hope of reducing the error of an estimate of the total climb and/or descent. They are also affected by the humidity profile, the temperature profile, and changes in the ambient pressure...

The SRTM DEMs have a resolution of 30m (98ft)*, much coarser than of a consumer GPS. There may be significant differences in small regions containing large amounts of relief. (Think of walking along the top or the bottom of a vertical cliff...) * Much of the world had SRTM DEMS with a 90m...

One other thing: don't forget to check your USB cable and port. Some of the Garmin USB cables include some "magic" (a resister between two of the pins) to make the GPS come up in a mode different from the mode that will result from a generic USB cable. (IIRC, generic cables result in "external...

How to bring down a drone: http://spectrum.ieee.org/automaton/robotics/drones/dutch-police-training-eagles-to-take-down-drones Doug

When we in Grand Canyon (back in the 1960s) we commented to a Ranger that we had seen a military aircraft flying in the canyon and he asked us if we had noted the tail number. We hadn't but it was clear that they wanted to enforce the no-fly zone regulations. So if you can, get the tail number...

Haven't tried it myself, but it should be possible. www.virtualbox.org Once you get a working guest machine image, you should be able to upgrade VirtualBox (to maintain compatibility with the host OS) and still run the old guest image. You can also clone a guest image before installing or...

Some thoughts and suggestions: * I don't use MS "operating systems" (for a number of reasons) so I can only guess about what is happening with Win10. * The 60CSx and 62series use different interfaces--the 60CSx uses a custom protocol (over USB) and the 62CSx mounts its internal and external...

Filters remove cysts and bacteria but not viruses. (2 ppm of iodine after filtering is very effective at killing viruses--purifiers often combine filtering and iodine.) Filters are adequate for most backcountry water, but if human and/or animal waste might be getting into the water, I would...

Read my previous post: Drones can legally fly over designated wilderness, but cannot land, take off, or be flown from designated wilderness. (I wish they were banned, but that appears to be the law.) Just because the noise doesn't bother you doesn't mean it doesn't bother other humans or...