Para calcular a classificação geral de estrelas e a análise percentual por estrela, não usamos uma média simples. Em vez disso, nosso sistema considera coisas como se uma avaliação é recente e se o avaliador comprou o item na Amazon. Ele também analisa avaliações para verificar a confiabilidade.
The product came super fast which was great, no issues there! I found the world map to be very vague. It’s not meant for Canadian waters. I did not purchase the Canadian chip map for Canadian lakes/waters so it might have been more in depth, but also the chip needs to be updated every year so I couldn’t justify the price of an additional $200+. I’m certain buyers living in the US have awesome reviews on this item. It just wasn’t for me and my needs and area.
This is a pretty good handheld marine gps unit. I got the 78s because it offered a tri-axial compass, so it is really like a 78sc, but without the built-in charts of the sc it was a couple hundred dollars less. One of the selling points for me, was the ability to upload custom maps to the device. With little effort, one can download all NOAA chart data and use the chart data to make maps for your Garmin. HOWEVER, after purchasing the Garmin 78s, then creating maps and loading maps, I discovered a huge flaw in the device. Custom map files are basically jpgs combined with a data file in a compressed format. The jpgs in the compressed file cannot be bigger than 1024x1024 and Garmin only allows 100 of these jpgs in any compressed file to be loaded in memory at one time. One single NOAA chart will contain 60-100 of these jpg files. Your device has the *storage* capacity for maybe 90 of these compressed map files, but Garmin only allows ~1 of these map files to be loaded into memory at once. Normally, I would say that this is not a big deal, IF THERE WAS AN INTERFACE to unload/load custom map files using the device. Sadly, this is not so. So, the only option is load the NOAA chart you want and when your boat has gone 10 miles, turn off your Garmin 78s, hook it up to a computer, navigate to your Garmin on computer, delete the NOAA file and then copy over the new NOAA file. Then disconnect from the computer and relaunch the Garmin 78s. Oh boy, I hope I haven't strayed into any submerged rocks during that time (but honestly, the chance that I am carrying my laptop around on a daysailer is nil.) Plus, my sole 25MB NOAA chart looks so lonely sitting in its 1.7GB of storage space. If Garmin would either change the 100 jpg limit to be 500 (like on the oregon or montana) or they would change their software to allow users to unload/load custom maps on the fly, I would gladly change this review to be 5 stars.
Seems like a product of the 70's. Despite that, I bought it because of its reflective and floating screen, unlike my mobile whose software is much friendlier and includes barometer, 3D compas, and others.