Posted by lfllmg on February 23, 2009
My apologies for this post, since it is a little deviation from my prior ones. But if you are like me, you are a bit schizophrenic and follow more than one topic.
I have been following my retirement funds and other investments, but then again who isn’t, looking for ways to re-balance to get ready for the (hopefully) imminent rebound. Diversify is the key word from from Cramer, Orman, Wong Ulrich to your local financial adviser. The inexes, major indicators, or SMIS (Security Market Indicator Series) like the Dow Jones Industrial Average (DJIA) or S&P500 are a sure way to diversify since buying into them means buying 30 or 500 companies from technology to financials to automotive (good luck with the last two). That is fundamentally correct. However, the way the index is calculated is the trick, especially in times of turmoil like the present.
According to Forbes’ Investopedia (http://www.investopedia.com/articles/02/082702.asp) the Dow is a price-weighted index which means that it gets calculated by simply adding up the price of each of the 30 stocks divided by a “constant” called the Dow divisor. For those of us that are geeky its current value is 0.1255527090.
For example, according to Yahoo Finance (http://finance.yahoo.com/q/cp?s=%5EDJI) the 30 DOW components closed today Feb 23th, 2009 as follows:
So the DOW’s pathetic 11-year low is calculated as follows:(5.81+2.15+4.463.91+2.14+25.12+62.94+18.91+16.97+8.85+1.77+18.71+29.28+
27.88+17.21+13.27+48.9+22.68+42.35+27.85+48.88+69.3)/ 0.1255527090 = 893.28 / 0.1255527090 = 7114.780773.
Besides wiping down 11 years of “growth” it has done something more important: some components are more important than others because they have lost less.
If you compare the influence of IBM vs. Citicorp (C), the former at 84.37 and the latter @ 2.14 (after an almost 10% rally, mind you) you’ll see what I mean. A 10% gain in IBM will mean around 0.94% in the Dow whereas a 10% gain in C will only mean a 0.024% in the DOW. in other words, C needs a 417% rally to have the same effect as a 10% IBM gain. If the bailout can pull that off … well you get my point.
Diversified? yes, balanced? I think not. If you are curious, as I am, a DOW index has the following weights:
Is there a good strategy for balancing this best? you’d think so, since financial and automotive have been hammered, they have been sent to the bottom of the list.
The S&P is a market cap weighted average so its calculation is different.
But these two are topics for a follow up post. Enjoy.
Posted by lfllmg on November 24, 2008
Another important apparatus for the road is the ubiquitous cellphone. Advances in technology have made it easier to carry a phone when you travel overseas. The vast majority of the world has selected the 3GPP standard (GSM) and since 2005 most GSM phones are quad-band, which means they are compatible with most networks around the world. North America is unfortunately the exception.
The market is roughly split in half with Verizon, Alltel, and Sprint (not the Nextel side) in the US; Bell and Telusin Canada, and Iusacell in Mexico being compatible with the 3GPP2 (CDMA) standard. Whereas AT&T, T-Mobile, Rogers, and Telcel are GSM carriers.
Before you jump on the plane it is a good idea to call your service provider and ask for the roaming agreements in the countries you will visit. They will either charge you a flat fee to enable international roaming or it is already in your plan. If you have to pay a fee, you can disable it upon your return. They will also know if your phone is compatible in those countries. If needed, they can provide you one to use during your trip.
If your provider is one of the CDMA carriers above, you will most likely need another phone with a different number that they will provide for the duration of your trip. Although a lot of new high end phones are now worldwide – which means they support both technologies – like the Blackberry Storm.
But buyers beware: International roaming is extremely expensive. It does not use your included minutes and can really add up. If you have a data plan that you use for email or browsing it can be a budget killer. You can disable the data service and re-enable it when you come back.
A cheaper idea is to buy a prepaid phone in the country you will travel. It is typically inexpensive and you can find them relatively easy in a shopping mall. You will of course get a different number, but you will save lots of money. Once you buy your local phone you can email the number to whoever you want. Also note that calling long distance from these prepaid phone can be expensive too.
SMS (aka text messaging) is the most cost effective way to communicate when abroad. You will pay for every message while on your trip, but it is typically $US 0.10 or so, a bit more for international messages. Again, call your carrier to make sure SMS will work during your travels.
Posted by lfllmg on November 18, 2008
Posted by lfllmg on November 16, 2008
In my ideal camera with GPS we figured that it does not work since you would have to keep your gps on all the time or it will take a very long time to get your location to mark the pic. But if your GPS recevier was connected or even better, part of your cellphone – and it had a software to take advantage of your cellphone’s connection – you could get your location in seconds.
Snap your pic, go to your phone’s gps software, and voila…
Now if only someone had a bluetooth or usb connection from the phone to the camera so your pic gets geotagged instantly, life will be good. Some software options work by synchronizing timestamps in both your camera and GPS. That works too, but you have to use a messy software and keep clocks in sync. If you forget or they move a couple of seconds the info will be bogus,
Even better if your phone had software that pulled the pic from your camera, add the coordinates, and send it directly to Flickr post it in Panoramio exactly where and when you took it.
Keep traveling with technology
Posted by lfllmg on November 16, 2008
As you know, gps systems work with a constellation of satellites that send time stamps to a receiver. By calculating the time of arrival of those time stamps and knowing the location of the satellites you can calculate the location of the receiver, aka get a fix (that is a geographical fix, not the other kind). This process is called triangulation.
In the triangulation process I described, besides the timestamps, the recevier needs to know the position of the satellites and then find at least 4 on site. It typically takes several minutes to find 4 satellites, but if you knew where they are, you’ll find them faster. Satellites follow orbits that are roughly known. The long term orbital postions of the satellites is stored in a file called the Almanac and short term variations are called ephemeris. Typically PNDs download the ephemeris from the satellites at a whoping speed of 50 bps (that is bits per second) so it is sloooow. This file is valid for several hours and it is typically downloaded when the device is first turned on during a 24 hour period or do. This can take up to several minutes. If you had a faster connection available to download the ephemeris you could get a much faster location of the satellites and a faster first fix. A connected PND such as the Shotgun or the defunct Dash has a cellphone like connection that can be at least 1000 times faster than the satellite. Hence, a connected PND can get the first fix in seconds. Good stuff.
Is that worth a $10 / $12 monthly fee?
If you have a TomTom you can get the ephemeris file from your PC via the connection utility before you leave home. It is valid for a bit more than 24 hours so you get the same effect. If you remember to plug it in every night after you come home, and take it back to your car when before you leave you will get the same effect for free. I never remember so I have learned to get a slow fix.
The traffic and weather feeds do require a monthy fee after the first 6 months. I tried them and found them not that useful. Granted my commute is 20 miles boring and usually traffic free.
It is not clear to me whether you can use the Shotgun overseas as a connected device and I belive it does not include maps outside the US or Canada. So as a traveling companion I’m not sure of its value.
Enjoy Tech and Trips
Posted by lfllmg on November 16, 2008
My pet peeve: How many times have you come home with 25G of pictures and forgot where you took them? Well, you could always take the picture and log the GPS coordinates. It is painful, terribly painful, especially if your PND does not support some kind of “quick fix” technology – most current PNDs don’t although that’s about to change (more on this on a future post). So why isn’t there a good digital camera with an integrated efficient GPS? I know they have been some failed trials, mainly due to battery consuption of the gps itself.
I just saw the new GEO35 from Wolverine. It looks like it is what I’m looking for, but I have to believe it drains the camera battery. Has any one tried it? Why not a belt mounted GPS receiver with its own battery so it maintains location. Snap your pic, plug your your gps and off you go. I know, I know, some of you are thinking, “plug it in?, that’s so 1990’s. Use bluetooth.” Maybe so, but the battery will have to be bigger …
Photo Trackr seems to work well (I have not tried it, but reviews seem positive). it works by syncronizing time in your camera and the GPS receiver. then some software on your computer does the tagging.
I’d love to hear opinions of users of the GEO35, Photo-trackr or any other camera w/gps.
Enjoy your TechTrips.