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20

If you're not using the device to find your way, it is useless as far as the GPS functionality is concerned, no matter whether it's switched on or off. If I know they are looking for me, would they pick up the signal, if I switch it on for short periods every now and again? What signal? The GPS signal is sent by satellites, GPS devices receive this ...


15

I'd give them whatever my device or map provided me, and let them convert to whatever their devices or maps use. Anyone used to receiving lat/lon coordinates regularly should be able to convert from various formats to whatever they use internally. You're the one in trouble with limited resources. You're out there with a broken leg, lost, in the cold or ...


11

I think you already answered your own question. Most dedicated GPS devices are more rugged, have better battery life, and don't require a data connection to work well. A phone has a lot of power overhead and is fragile. There are a few possible advantages to a phone. If you're already going to be carrying one, it reduces the total weight required. It's ...


9

Use the GPS to determine your position and then text or email that to your rescuers. That will be the end of the GPS's contribution to the rescue process. Staying put is generally best (saves your energy and ensures you don't move into an area they have searched and think you are not in) but that place should be safe and you should be discoverable in it. ...


8

Most GPS receivers in phones work not nearly as good as stand-alone GPS devices. Usually, one wouldn't notice this because phones use assisted GPS where they get the orbital data and/or almanac of the GPS satellites as well as the exact time from the GSM network. Also, they have a average position of the device. Without that data, phones are very slow ...


7

I would recommend UTM coordinates; it avoids the formatting uncertainty of lat/long and is better suited for ground operations. (Easy to translate to paper maps, define search areas, and calculate distances.) If you use the WGS84 datum, the numerical portions are also identical with the military grid reference system (MGRS) and the national grid (USNG). ...


6

Disclaimer: I rarely use GPS system personally so feel free to correct me if I've misunderstood something. However, I think that 2000 points should be more than enough. Say you are doing a reasonably long route of 40km per day. If you use all 2000 points in that distance that will give you one point every 20m. Give that the accuracy of your GPS under some ...


5

I use Timble GPS Hunt Pro on my Samsung Galaxy S5 phone. You can download topo, BLM boundaries, private property and other types of maps that work just fine without a cell signal. The maps I use are incredibly detailed. If you do have cell coverage, you can add weather overlays. Map prices are reasonable, and you can buy a subscription that lets you ...


4

On mobile devices, the Gaia GPS app allows creating a waypoint using whichever format is currently selected (which includes UTM). From your computer, you can enter UTM coordinates into CalTopo; this is convenient if you are printing out paper maps. (It also has some ability to annotate maps and save them to KMZ/KML files for use with Google Earth or your ...


4

There are many devices that will let you enter in UTM and LatLong coordinates interchangeably. be sure to bring a waterproof map with you too though. http://www.rei.com/product/869473/garmin-gpsmap-64-gps http://www.magellangps.com/Store/eXploristSeries/eXplorist-510


4

Very rough rule of thumb is that effort distance (ED) is horizontal distance (HD) + 5 * Vertical distance (VD) So ED = HD + VD example: A recent hike I took had a horizontal distance of 85 miles, and a vertical distance (up and down) of 25,000 feet. The effort distance ED = 85 + 125000/5280 or 110 miles. In practice I've found that there is a critical ...


3

Interesting question... It would be hard to really quantify something like this because it will be different for each person. Sure walking up a steep hill is always challenging, but some people are much better at it (but might struggle with steep downhill walks?). Determining your Pace Index (how fast in MPH or KPH you walk), using your travel hiking ...


3

For your situation I strongly advice against relying on your phone. It's a great backup but to much of a risk to use as a main device. Three reasons to get a dedicated gps: Batteries: A gps mostly works on standard AA batteries which can be bought anywhere and rechargeable ones are easily charged on solar energy. (look up goal-zero for instance). ...


2

Let's go through the different aspects of phone versus dedicated GPS device point by point (however, quite surely without being complete). Basically you have to decide which points apply in your situation and how you weigh them. GPS reception and accuracy When the first smartphones with GPS units hit the market, there was the saying that their GPS ...


2

Two scenarios are to be explored. Do you have mobile coverage? Yes? Then just find out your gps coordinates, send them to your rescuer. And stay put. In case your location changes, resend them (sounds lame but essential). Since you are asking about battery life, it's okay to switch off your GPS (given the device[mobile/watch] provides that option) to ...


2

Always have a water proof map of the area you're traveling in ( one with coordinates on each side if you can help it ), and a compass you can use to triangulate your position with. You'll be better prepared in an emergency and more confident outdoors in general if you practice triangulating your position until it comes naturally: ...


1

In the marine environment, it's often a little easier if you reference a known location. Offshore, you want to use lat/lon coordinates for sure. But if you're a mile from the coast (or less), it's a lot easier for people to find you if you say "We're a hundred yards south of buoy three, looking at the hotel with the red roof." I worked for a water rescue ...



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