Hadron Quark said:I'm having difficulty in choosing a bike mounted gps solution. Anyone
got any experience? Primarily I want a system which can show a small map
and prompt things like "turn left onto sesame street in 2.2 km" etc -
fancy graphics & colour/audio not required. cadence/hart beat not really
important either.
I've been using a GPS receiver in lieu of a regular cyclometer on my
bike for the last 7 years and about 60 kmiles. The two models I
currently use are Garmin's eMap and GPS V, which are both fairly old
(the eMap has been discontinued for awhile and the V probably will be
soon). Both can be loaded with detailed maps of the area where I'm
riding and both can provide most of the standard data of cyclometers:
current speed, max. speed, average moving and overall speeds, trip and
cumulative odometers, time of day, etc.
The maps (Garmin's MetroGuide & CitySelect) on both are quite detailed,
showing essentially all residential and rural roads as well as many
business locations of which some are particularly useful while touring
(grocery stores, restaurants/delis/etc., motels/hotels, local
attractions). The V supports automatically determining a route to a
destination and giving turn-by-turn directions whereas the older eMap
can't calculate such routes directly but can use pre-planned routes
established before the trip on a PC. The route calculation has an
option to specify the vehicle type as a bicycle so you won't be routed
on highways that prohibit bikes. But I'd note that in most cases
bicyclists have some specific road and terrain preferences that are
going to be hard for any automated routing algorithm to include.
In deciding on a particular model be sure you include consideration of
the maps that you'll also want to be using. The GPS V that I sometimes
use is still available and costs about $200 *including* detailed maps
for the US/Canada. It's main drawback is that it has limited memory so
it can only hold a limited number of maps at a time. OK for use in a
metro area (say SF, Oakland, San Jose and surroundings) but not
adequate for an extended tour. Next step up would be the Quest for
about $300 which has more memory and color but does have the issue of a
built-in battery which requires a bit of ingenuity to recharge while on
tour. The LegendCx sells for about $250 and adding the maps brings
that up to about $370. It can use microSd cards to hold very large
numbers of maps. The VistaCx is similar but costs about $40 more but
includes a barometric sensor for slightly more accurate altitude
measurements. It also provides data on things like cumulative
elevation gain. Any of the above can easily be mounted on your bicycle
handlebars and/or stem.