C-Map's new Reveal layer & sea floor images

[Andy135]

@Johnboijon, I originally posted the below on our old Outlaws forum site - just dug it out and re-posted it here in case it helps you or anyone else.

 

I recently invested in a C-Map Max N+ card with their new Reveal layer - one of the guys in my club had sent round a Whatsapp image of his plotter showing some amazing images of the sea floor so I wanted to see for myself. I consider myself a Navionics fan because of their detailed contours, but the C-Map Reveal sea floor interpretation takes this to the next level.

This first image is just south of the Owers, off Selsey Bill. That great big hole shows up nice and clearly, including the steep face of the NNW wall of the hole. Got to be worth a drift over that.

And below is a close up of the wreck from the image above.


Here's an image of a wreck that I had marked on my plotter already showing good correlation between my bow and stern marks and the underlying sea floor mapping.

 

I reckon C-Map have licensed some of the sea-floor mapping data from the DORIS site as the C-Map coverage (or rather the gaps in coverage) of the St Catherine's Deep area are pretty much identical to DORIS's, which can't be a coincidence.

The Reveal layer could be a great way to find that little patch of unfished rough ground that doesn't show up on a regular chart. I already have a few marks picked out in my neck of the woods to try out.

[GPSguru]

Excellent stuff Andy, Garmin also do the same with their G3 3D mapping ...............

 

I think that wreck is the SS Fallodon which was torpedoed in 1917,  ............... The data from wrecksite does suggest that there is an extensive scour of up to 39m all around the wreck, so probably good for Turbot & Plaice at the right time of the tide ............ here is the latest verbiage ...........

SEP 2016/000165703 14.11.16 EXAM'D 13.11.16 IN 5026.291N, 0113.174W [WGD]. LEAST M/B DEPTH 28.24MTRS IN GEN DEPTH 35MTRS. LENGTH 107MTRS, WIDTH 28MTRS, HT 6.7MTRS, ORIENTATION 148DEGS. SCOUR LENGTH 85MTRS, TOWARDS 087 DEGS. STARBOARD HULL LARGELY COLLAPSED ON TOP OF THE REMAINS OF THE VESSEL. SHALLOW MOST POINT IS AT THE STERN. A BOILER IS VISIBLE IN THE CENTRE OF THE WK. (MMT UK, HI 1499). AMEND DW 28MTRS IN REVISED POSN.

Edited November 1, 2020 by GPSguru

[Andy135]

Could be Ian. I think I have some numbers for the Fallodon somewhere that I'll dig out and cross-reference with my plotter.

So many wrecks, so little time! 😖

[JDP]

I received some of these bathymetric charts about 12 years ago from one of the survey vessels when it was only available to researchers. At the time I had to upload it into google earth and layer it on their mapping to get true lat and long positions from it and unfortunately it doesn't simply cover everywhere. Purchasing is done in sections of coast and far more expensive than other charts.

Garmins G3 is not the same, which is disappointing having moved away from Lowrance. I was told however that Garmin own this and it will soon be available to Garmin users but in all honesty if people have transducers such as the GT51 they can soon scan sea floors for themselves even in relatively deep water.

 

[GPSguru]

8 hours ago, JDP said:

Garmins G3 is not the same, which is disappointing having moved away from Lowrance. I was told however that Garmin own this and it will soon be available to Garmin users but in all honesty if people have transducers such as the GT51 they can soon scan sea floors for themselves even in relatively deep water.

True to a degree, but I was under the impression that you could use the G3 3D function to build a 3D seabed image based on the contours. Fortunately, these days with multi core, multi thread processors, this type of processing intensive work is quick and easy.

The only issue with Quickdraw is that it is quite time consuming, and the most you can store in one map is 32Gb ..................

[Johnboijon]

Thanks. Read through this last night when nature called at 3am. Looks the part. I note you are selling yours though. Why? 

[Andy135]

13 minutes ago, Johnboijon said:

Thanks. Read through this last night when nature called at 3am. Looks the part. I note you are selling yours though. Why? 

I recently bought another Lowrance plotter, and in order to benefit from the Cashback offer they're running (details here: https://www.lowrance.com/en-gb/upgrade/) I ordered another Reveal chart with the Plotter. I deliberately went for the Reveal card as I know it will be desirable and therefore easier to sell on - I don't need a second one as my existing Reveal card is networked to all my plotters already.

Based on your location I don't believe the card I have for sale will be useful for you however, as I don't think it covers far enough north for your patch. You'd need the "Nth Channel to Firth of Forth" version I believe.