I did realise the dual functionality of this device, or actually tripple: that is the main advantage to me. I hope to use it to measure my speed on bike, geolocate my photos and navigate on my cellphone.

I think you are half right on JSR-179. Aside from the 'native' Mac syncing, Symbian phones can run Symbian C++ programs besides J2ME programs. Many great navigation utilities have been written for S60 release 3: they use the Symbian Location Based Services API. One neat feature is cross-application Landmarks: the waypoints in Nokia Navigator show up in Google Maps. As far as I understand things, the Operating System parses all NMEA data and gives simple data to the applications that abide to the LBS specs.

Plumbargains sells the M-241 for a good price, they claimed Nokia phones are working. Yes, as I commented to their post: does it work with the API?

I'm not personally familiar with the S60 Symbian-based E61, but believe it to be using the Java JSR 179 Location API. Although this API supports GPS over Bluetooth, apparently implementations are often non-standard. That said, according to this Nokia page you can do on-device logging with "any Bluetooth enabled GPS module known to work with your phone". From the comments in the links you provided, it would seem that the ability to use the M-241 with the E61 or not depends on how a particular program is utilizing this API. It looks like you already have tabs in the right places to find a definitive answer—if there is one!

Has anyone tested it with Nokia's locationing? I would like to connect my Nokia E61 to the M-241 for navigating. Some sources warn me the Nokia's built-in locationing service does not support the Holux (programs that talk to the M-241 directly have no problem). I find it odd!

References:
Comments in Richard's Tech Review
Complaints at Nokia forum

I have raised this issue on GPSPassion forums (excellent topic, with Nokia support and with Holux Europe.

I was looking for GPS data logger which help me to tag my photos on Linux and this seems to be a good choice.

Regarding battery problem I can share my own experience, maybe it would be useful to someone (as I've used battery brands mentioned here).

I've KM Dimage Z3 camera which is known to be power hungry. I've used GP 2300, Energizer 2500mah and Uniross 2300. GP and Uniross was one of oldest and Energizer newest. All of them were charged with Maha charger which doesn't have discharge function, and since camera drain batteries not equally only one battery was discharged fully and the rest didn't go through fully cycle which leads to capacity lost.

So I can tell that Energizer was first out of run, it worked barely few months before become able to hold charge only for one day...

Same happened later to Uniross but it lasts about 3 years and GP gone after 3-4 years also. At one point I was simply not able to use batteries if they weren't charged today...

Later I've got myself LaCross 700 charging unit which is able to measure battery capacity and discharge them individually. This totally solved battery memory problem(with new batteries, old ones wasn't able to regain charge for long time).

Now I'm constantly track capacities of batteries used in my camera and other appliances and can tell that Energizer is really not good performer from what it's appear, it loosing charge very quickly.

The best battery I was able to find till now are GP ReCyko which goes for ~$14 (shipping included) for 4 pack, it's pretty cheap comparing that in our country you can buy one battery for 10$. I can tell that for 4 months of using it, this battery is my favorite, it's not have so high mAh as others, but it's not discharging like others when not in use... with other brands if they spend few days in camera indicator goes to half and after short shooting session camera is dying, with this one I've got full charge even after three weeks.

From what I know other companies also have similar type of accumulators like Sanyo Eneloop or Duracell Precharged but I didn't tried them because of high price.
You can read about those brands of batteries and some reviews here.

Also descent NiMH charger with discharge function is must have to maintain good life of batteries you're using, probably it's not the case if device require only one battery as it would probably drain it and there would be full cycle anyway.

Hope this info helps a bit. If anyone got some data about using this device on Linux I'll appreciate if you share it here. Also would like to hear feedback about accuracy of M241 in Eastern hemisphere.

Greetings to everyone!

I Bought my 241 a little more than 2 weeks ago after a very unsatisfactory experience with another data logger ( and the seller ). After reading around I was concerned with the battery life so I also ordered a 4 pack of 2700mah AA batteries from a e-bay merchant. Also picked up a 4 pack of enegizer e-lithium batteries to test with it also.

My test method was far from perfect but probably close enough for you all to get a general idea of what to expect. What I did is simply erase the units memory, and let it record data points at 1 point a second until the battery gave up. Then put another battery in the unit, recorded how much memory was left, and subtracted that from the total memory available. This gave me the total number of seconds the unit had been on and recording and by extraction how many hours and min it was running and recording.

Of course I'm sure there is some error that creeps in.. but the idea was to get some kind of baseline and expectation for people thinking about getting this unit.

Oh. Unless otherwise noted with ( BT ). The unit was NOT transmitting via Bluetooth. If there is a (BT) notation I was using the MiniGPS application while logging to see how much the Bluetooth transmitter added to battery drain..

Ready for the results? Ok.. here we go....

Memory Left // Hours Running // Battery Type

105300 7.149 hrs ( old 2000mhr battery)

Just got the unit and popped in the first charged battery I could find. Not really a fair result as I was playing around a lot with it, Stopping the logging to download data and activating the backlight.

96810 9.5-10.5 ( new 2700 battery #1 ) first discharge ( played around here too )
87415 12.1 ( new 2700 battery #1 ) second discharge
94249 10.21 ( new 2700 battery #1 ) third Discharge

101318 7.14 #1 (BT) With bluetooth transmitting

121800 2.56 ( 2700 battery #2 ) first charge
61965 19.18 ( 2700 battery #2 ) Second Charge
98716 8.97 ( 2700 battery #2 ) Third Charge

91136 11.08 ( 2700 battery #3 ) First Charge
90651 11.21 ( 2700 Battery#3 ) Second Charge
91966 10.85 ( 2700 Battery #3 ) Third Charge
92733 10.64 Fourth charge

96875 9.48 #3 (BT) W/ Bluetooth

91944 10.85 ( 2700 Battery #4 ) First Charge
96389 9.62 ( 2700 Battery #4 ) Second Charge

67481 17.65 Energizer E-Lithium Disposable
81676 13.71 Energizer E-Lithium

The results with battery #2 were very strange and I have no idea what the cause was.

As far as the units performance goes.. overall I would say.. 'Fair' It is less accurate than my old bluetooth mouse ( 2 years old ).

Accuracy is a drawback. as is the software that comes with it. The included software is bad. I mean really bad.. The only thing I could get it to do was to download the wapoints and to covert them to other formats. I have yet to be able to get the software to to actual geotagging.

However using the Locr GPS Photo software I was able to properly geotag my photos. Yes, it's an extra step.. but.. as long as it works. right?

The Unit has a few other weak points in my opinion.. Weak battery door, backlight does not stay on when plugged into the USB port, Battery indicator is too small.

BUT.. the LCD display trumps nearly all of this ( except for the weak software ). having the ability to look down see whatever data you want ( speed, distance, position etc.. ) and to know you have a satellite lock and that it is recording is so useful and reassuring. MUCH better than the other unit I bought where I have to remember what it means when this light blinks, this one is solid.. and the other has no light at all.. Also nice that it does not draw attention to itself by blinking LED's ( can cause a little trouble around paranoid airport / metro workers ).

Oh.. also the Bluetooth. The other 2 GPS units I have have a particular quirk that I have learned to deal with. When I used them on ( 1 Sony 2 HP notebooks ) with MS Streets & Trips. If I get out of Bluetooth range ( or turn the unit off ) I have to restart the GPS unit, then reboot the notebook to get it to connect again. what a pain in the $$$$. No such problem with this unit..

So,, overall I would say this unit is definitely a buy. Yes.. it has some problems but not so much I would wait for the next version.

Hope you don't mind that I didn't go into name brands of the batteries or other GPS units I own. I'm not here to promote one brand of battery over another or to berate other GPS units. But, if you would like the details I'll be happy to post them upon request. Also. will be posting this under a few other blogs.. Just to save the time of writing it again..

Hope it helps someone
Brian

The only GPS device I know of that mounts directly on the OS X desktop as a USB mass storage device is the AMOD AGL3080. No Bluetooth, however.